If he is indeed trying to push a socialist agenda, it's because he feels that a socialist state would better serve the entire population of the USA as opposed to free market capitalism. In his own mind, he's not trying to ruin the country, he's trying to improve it.
I'm not going to say I agree with the agenda (I'm a good little capitalist), but don't fall for the hyperbole of the "shouters" (on both sides) who simply try to destroy anything on the other side.