They rely on people believing this one fallacy:
"My spending is for the greater good, while your spending is selfish."
They push that message relentlessly through propaganda, and create masses of naive/gullible commies.
Discussion
While I think that community is important, and that less capable people can benefit from charity coming from the top, that charity should be motivated by guilt or pity, or from a sense of plentiful resource generosity, it should never be compelled or proctored by any government.