muds. if he likes games, actual games, if he cares about the mechanics. muds will do it. easy to get into, easy to progress to programming, and tons more depth the more he gets into it. if he can't do without the graphics, could always help him build an mmo, i'm pretty sure there are a few open source ones out there. either way, the toolset only goes so far and instils a hunger for more creative and mechanical control that only programming gives.

"because of race, religion, age, disability, sex, marital status or sexual orientation." all of your examples seem to be about hating people for actions or things they have actually done, so not covered. or do you hate people with sexual orientation towards kids/animals even if they never acted on them and are seeking help? being able to say "i hate all blacks/jews/handicapped and i think we should form a group to wipe these disgusting sub-humans out" is not a necessary evil.