As much as I dislike Chelsea, as I always say I support my team and whoever is playing Chelsea.
But this is a social problem, how can you blame a football team for something that happens on the metro.
All they can do is if the guilty people are caught they can only ban them from the ground, even that is difficult.

But if they get grief because of it, I won't lose any sleep over it - but I think it would be unfair!