The motto of all liberals is “With my guilt and your gelt we can do anything!”
I believe they are this way because, largely, they are people who find themselves in a situation where they make so much money so easily, they feel guilty.
And thus they try to expunge their guilt by transferring it on the rest of society. They assume that anyone who has money acquired it as easily as they did, and therefore they must help to redistribute it to those less fortunate. But not at the expense of their own lifestyle, of course.