[mef]

IMO it's because there's both benefit and waste/corruption in these kinds of social benefit structures. some people choose to only see one or the other:

"these benefit everyone including those who don't use them directly! how could you be against it?"

"this money that I'm having to pay is either overpaid to corrupt vendors, or just straight wasted, why would we ever want to increase how much we're paying into this system?"

in reality you can't have one without the other. it's up to each person to decide whether they can take the bad with the good