The government has no money except what it takes from the people. But the people are not donating their money to the causes that the socialists want them to, so they have to take the people’s money to fund these causes. So who is to decide how much money to take and which causes to give it to? Well, the politicians, of course. But who elects the politicians? The same people whom the socialists think are not smart enough to decide where their money should go.
So there is the dilemma of democratic socialism: if the people are not smart enough to decide where their money should go, how can they be smart enough to decide who the deciders will be?