Edam, if DLA was the only 'budget line' being cut then I'd be totally with you.
But the fact is that the government is cutting everywhere. I don't think I have to post links to that fact. Virtually every department has faced cuts/restrictions/freezes, call it what you will.
These have been done out of necessity. The changes we're talking about here were started by Labour and continued by the Tory/LibDems. So it seems across the political spectrum there is a realisation that the status quo is not sustainable. It's notable that although Labour are opposing everything, they're not proposing turning back the clock on this one. In fact thinking about it they oppose everything but have not said one thing they'd repeal if/when they get back in power.
To call it an active choice and that the government is choosing to pick on the disabled is akin to saying Greece/Spain/Ireland are picking on the vulnerable by cutting their budgets. It's simply disingenuous.