Certainly the suggestion that people with disabilities "are not worth the minimum wage" is blatantly unlawful under the Equality Act 2010.
The fact that Cameron has experience of living with disability in his family through his father and his son is not the issue. It is the way he used that experience to avoid answering legitimate questions about the gaffe-prone David Freud's deplorable comments.
I am dismayed to read RowanMumsnet's comments about not criticising public figures because it may damage future MN campaigns.
That implies that successful campaigns require matey, privileged relationships with those in power, rather than good research, good arguments, public support and the effective use of our democratic process.
I realise that MN is not a democratic organisation. However, curtailing free speech on the basis that it might offend your important political chums seems rather inappropriate.