Absolutely.
But the assertion that seems to be made that nothing is being done, or especially 'lefties' don't want anything to be done is just nonsense. There is a lot being done, by a lot of countries in the world since it's not just the West ISIS hate and are attacking, they just seem to hate everyone! There is military action against them in their own territories, infiltration of their networks, going after their funding, there is a war going on and I wouldn't say we were losing it.
Thing is with Terrorist groups, history shows that political dialogue not military force is the most effective solution to ending hostilities, but with ISIS they seem to have no inclination to want to talk, they just seem to want to kill anyone who isnt ISIS and as such they just need wiping off the face of the planet imo.
But what the 'lefties' don't want to do is have some sort of hysterical overreaction when something happens on our home ground - thankfully very rarely because of the good work being done by the security services - and start banning/deporting everyone who looks slightly suspicious or believes in a certain religion or "build a wall" around the entire country when this is not going to defeat ISIS or make us any appreciably safer. The war, thankfully, is not being fought on our soil and some single British guy who for his own reasons took up their twisted cause is not waves of ISIS soldiers invading our lands and one which unfortunately, no matter what draconian measures you bring into force, you are never going to stop happening