I think it is wrong for you to call for the bad of a person for doing nothing other that having a view you oppose. If he breaks the law, yes.

As a black man studying in the UK, my friends were surprised I thought it was wrong to silence Nick Griffin of the British National Party. I obviously did not support his views because that meant my ass would be on a ship back to 'Africa'. I took my position because it meant his views could be publicly counterd and ridiculed on merit. Chasing a person you dont agree with might give the views more value than it has.

Asides that that, there is a chance of you changing his or the mind of his followers. I rather have that than the person propergating a gospel I disagree with underground.