To add to what durhamjen mentioned, The CAB has produced a very damning report on benefit sanctions. And there is little doubt that IDS and cronies will call them liars too! I would put the link here but it won't copy and appears to be encrypted, but just Google "CAB report punishing poverty" if you want to find it.
Going back to the OP, I totally disagree about IDS being someone who is "... not trying to win a popularity contest".
Being seen to hit the scrounging, skiving welfare claimant (the Government's emotive words, not mine) has proved hugely popular with the general public. Having realised that they are on to a good thing (ie., a potential vote-winner), they are keen to keep up constant stream of anti-welfare rhetoric.
In reality, many of the measures are having the opposite effect from the one that is claimed and desired, but IDS and his colleagues have discovered that simply refusing to acknowledge this is the simplest way to deal with it!
As far as I can see, his speech is typical of their "say what the public want to hear" approach and is entirely about popularity.