"Hey, that guy pays less than me, but he still gets all the benefits that me and my family do. I'm just going to pay less in that case"
"You know what, my contributions don't really matter - if I pay nothing, the schools will still work, the roads will still get built. Really, it would be stupid to pay in that case"
"I don't use that service, and people who live on benefits are just lazy, why should I be helping to pay for all of that?"
Me me me me me me me meme meme meme...oh dear God I've turned into a meme.