Because Hezbollah is fighting ISIS.
Politics of the Middle East: What is the relationship between ISIL and Hezbollah?
The solution to the Islamic madness is extremely simple - don't import any of them, kick out the Muslims who are already here, cut off their countries trade and finance, and let them hack each other to death.
Muslims HATE each other. The VAST amount of Muslim terrorism and murder takes place between themselves. That's why they go to the West, to get a fresh start. That's why what Merkel and Obama and Hillary are doing is so fantastically evil - Islam is killing itself, and they're offering OUR BLOOD to keep it alive.