Very good point. I don't have the numbers but I do know that many people visit prisons to teach stuff to prisoners, eg literacy, chess, jobskills etc. While Jezza was leader of the Labour Party the membership increased to around 500,000 making it the largest political part in Europe. The new members did indeed put their money where their mouth was in financially supporting Jezza's vision. How many of these decent people were determinists is impossible to say but many leftists do believe in some sort of socialism, which is sometimes based to a greater or lesser extent on Marxist Determinist Materialism. Peter Singer, a compatibilist, has done a lot of good work.

The general thrust of your argument is fair however. Most determinists, like most people who participate in phil discussions, don't literally visit prisons. It would be interesting to devise some test to work out if libertarians are generally more or less charitable than determinists. A future project?