I fancy that the principle of "Occam's razor"* applies here.
Members of Parliament have felt themselves rather put-upon by the media, especially the press, of late. Much of the thrust behind recent events is no more than revenge. Revenge dressed up to look like a re-appearance of back bone, but as ever a semblance shall suffice.
*
http://en.wikipedia.org/wiki/Occam%27s_razorIgnorance is bliss, bliss is happiness, I am happy...to draw your attention to the possible connectivity in the foregoing.