If necessary, yes!! Why not!???
These people are using, or hiding behind your faith! If you don't support them, don't support their beliefs and aims, then say so! Say it loud and clear.
Because until every decent Muslim unites to drive these extremists away from the cover they're using, you will all be tarred with the same brush in the minds of many.
All that is necessary for evil to flourish is for good men to do nothing!
How many times does the condemnation from muslims come with a 'but...' and then comments relating to incidents abroad by western allies? And yes, I respect the fact that the bulk of those that have taken arms against IS are muslim.