Let us hope that "ICT" is dead and buried
Peter, I am not sure we are so far apart. It is question of the level at which you address the issues - and in a way it echoes the Gove vs. Rosen set-to on language. Rosen, it seems to me, is talking about the study of linguistics, Gove is talking about the ability to study a version of English that will prove most useful to children. I am with Gove, not because the study of linguistics is not valid - but I do not think it is what will be most useful to KS3 children. There is also a danger that, in teaching university level stuff at KS3, you end up with a platitudinous mush.
On the impact of computers on society, I think dealing with peer pressure on Facebook and protecting confidential information are critical issues which at the moment are only dealt with at KS1 and ought to be promoted further up the curriculum (at least to KS2, which is where - though I have not taught at this level - I would have thought children would be adopting an online persona for real).
As for "thinking for yourself", this is a much more fundamental issue, part of the core academic curriculum, led by analytical subjects such as History. The way I would see this working is that Computing would give children the prerequisite digital skills (as defined by the Royal Society) to navigate the web and manipulate web resources, and let the History teacher (perhaps with cross-curriculum support from the Computing teacher) run a "contemporary History" project, showing the similarities between the skills required to evaluate Nazi propaganda with the ability to evaluate some of the stuff that you are likely to find on the web. A "contemporary issues" discussion or debate might take this forward by questioning whether the internet revolution has brought benefit or harm to the way information is circulated and accessed.
So on the particular case of the effect of IT on society, I am all for stimulating debate and intellectual curiosity and pointing out the relevance of abstract learning to the here and now; and I am also all for helping students lead their own lives at a PSHE level. What I am against is making the computer's effect on society a hard curriculum topic, any more than we should get KS3 children writing about euthanasia, abortion and homosexual marriage. It's all good stuff, maybe for an A level ethics or sociology course - but I just think that at KS3 it will hit the platitudinous waffle trap.
On the general question of cross-curriculum activity, I am all for finding synergies. But I am against Computing hijacking creative / evaluative / analytical learning which is properly the domain of other subjects. It should rather deliver the prerequisite digital skills to enable those subjects to address their traditional subject matter, working through digital media.
In an ideal world I would agree that we should be expecting 'the <insert subject> teacher' to address the big issues in their subject, whilst the Computing teacher has ensured that the children have the necessary level of digital literacy to be able to use digital technology to help them do so. However, I think that the competences required to use digital technology go beyond the ability to operate the technology, and incorporate what in the past we might have called ICT Competence (a broad set of knowledge (i.e. the ability to apply information), understanding and skills related to digital technology). Furthermore, whilst learning digital literacy 'in situ' (e.g. across the curriculum) would be better than having it as a discrete subset of Computing, in practice at present if it isn't explicitly specified in the PoS then there is a serious danger that it will not be addressed (or at best will be addressed inconsistently by different teachers).
Repeating what I have just written on another thread, I think the difference is between curriculum aims and pedagogy.
One of the great benefits of the new Computing curriculum, which I have been arguing for for a long time, is the disentangling of the teaching of technology and the use of technology to improve teaching. I think what we are discussing here is part of the second of these points. I don't think that technology changes the fundamental other subjects - but it does change the way that it can be taught and the fundamental learning contextualised.
Why do teachers not read the academic literature or research evidence? How do we stimulate a more vigorous debate (1) on pedagogy as a "design science" and (2) on ways in which technology can help that process? How do we stimulate a pull dynamic, rather than always relying on a government funded push? For me, those are the key questions.
We clearly disagree about the extent to which digital technology impacts on disciplines and should therefore impact on school subjects. Whilst we agree that what I've been calling TEL shouldn't be the focus of Computing (the subject).
However I think that digital literacy (my broad definition rather than the narrow technical skills definition) is different to both of the above things and does need to be taught as a discrete subject for reasons already set out in other posts in this discussion.
It seems to me that digital literacy is more important than computer science on the basis that everybody needs to be digitally literate whilst only a minority of folk need to be computer scientists.