Regretfully this type of terrorism is impossible to stop.
Obama is making it easy for them.
Terrorism is a tactic and can’t ever be stopped completely, but it can certainly be reduced significantly by banning Islam in civilized countries. ISIS is not the threat; Islam is the threat. Close mosques, deport all Muslims, bring US troops home and put them on our borders, and institute a “pet the pig” requirement to board a plane or enter a western nation. Problem largely solved.
For extra security, tell the Muslim world that the next act of terror in any western nation will result in Mecca being nuked and covered in pig’s blood afterwards.
If the Shia and Sunni want to fight each other, let them do it in their own crappy countries.
Fighting for any Muslim (supposedly our allies) is not in the interests of the US. There are no good guys there.