we don't work only to support ourselves though itmustbe - we work as a collective, a society, and we pay taxes and NI to take care of our collective needs and as part of a contract which shouldn't have it's termed changed by the party with all the power. we also raise children, care for elderly relatives, volunteer, are happy to contribute to the costs of looking after the sick and elderly, pay overseas aid, take in refugees, uphold the roads and infrastructure and the arts and education, etc etc all of which contributes to that society and uphold our end of the contract. we DON'T live in a system or an ideology where we just work to support ourselves and ourselves only
if the contract becomes work till the day you die, watch every public service (and the jobs they were made up of) be slashed to nothing, have the rules changed at whim etc without any consultation whilst the rich keep raking it in and profiting from selling off and cutting everything, avoiding even paying tax and those in power take care only of their own groups interests then that contract has been torn up.
note also these changes disproportionately effect those who have the least power to influence policy and the least ability to financially prosper.
it's not as simple as oh look it's a balancing of the books sillies. there is ideology, class, power, gender, protected interests etc involved. working to support yourself is dead simple sounding and neutral if you don't factor in these elements and take myopic and frankly deliberately deceiptful meritocracy type perspectives of reality and society.