I think Mulsanne was actually making the point that some people are very unkind about claimants and this makes her angry. 
WRT parents of disabled children working, I think this is such a good idea as they have often got so much to offer, and if they're working, they are out of the home for a few hours a week and slap bang in the mainstream once again. This means they are more visible, and able to influence those around them for the better.
If I were in Government I would be tempted to bring in a Disability Working Allowance for those who are disabled or who have disabled children, to help with childcare costs/provision and employment costs (eg minimising commuting times and inconvenience, that kind of thing). Something like that, anyway. At the moment so many people are heavily penalised for taking up low paid work, or find it impossible to get specialist childcare, even though we know it's in everyone's interests for adults to be out of the home doing something independent for a bit of time each week.