elderly (obviously they're all faking it)
always knew those dastardly elderly were faking age. Don't get me started on all these workshy "dead" people
Mix that in with radicalization of (ironically) many poor workers to knee jerk question and resent anyone who does become old enough or disabled enough to break through all the means testing and red tape to get benefits and, of course, racism, and it's a perfect recipe for advocating against their own best interests
once knew a guy who would say "I've broken every bone in my body who needs health and safety" he really was a fucking moron
on the general point
I agree about the problem but they might be true believers and just not realise the problem they are creating. It's entirely possible that they don't understand that these issues will happen because they don't actually think about what happens to poor people