Generically speaking I think it is a good idea to being fringe groups, whether they are violent or not, into government. Obviously this is not always practical; but when it is I think it benefits society to have these groups forced to deal with day to day governance. This forces them to be more responsive to the society and gives them a stake in the government, theoretically making them less interested in its destruction. Of course you have to remember there are some people you just can’t reason with.