They're not doing it entirely out of the kindness of their hearts to be fair. There's a stipulation that the clubs must put the money towards the upkeep of the pitch, including getting rid of artificial pitches and replacing them with grass. Given how much people complain about the artificial pitches in Scotland there could well be some merit in the idea.
Not defending his actions at all however the boy who he was involved with supposedly has some very controversial views, and there's an old pic going around of him celebrating a goal with a nazi salute. It's not too much of a stretch to imagine he was saying some pretty nasty things to provoke him. That's no excuse but it might provide a little more context if true.