I guess everybody has different opinions about what is a war and what is not. Regardless of that, I don't see why anyone would think war is the solution here. Fighting back against ISIS is indeed the only option here as they don't let themselves be influenced by anything else, at least it is in my opinion. War would just mean that all countries that are against ISIS would declare it war. Then there's the problem that ISIS is not a country but a group of individuals within a country which causes law restrictions. This whole thing of some people saying ''just nuke them all'' or ''just kill them all'' is the countless times simplified action of what we're able to do in this situation. Countless of factors need to be taken in consideration which people such as you and I don't have any influence in, only high-political individuals.
There are some far-right political groups here who think, and I'm sure these are statements that are made in other countries too, that we need to close all borders. Or even more right-winged, just don't let anybody in. Unless your country has declared itself neutral in this situation, then that isn't going to happen, I'm very sorry. And even if it did, I doubt members of ISIS will respect anyone's neutrality. To be honest, I personally don't see the whole connection with refugee crisis and terrorism as some people make them.
Oh, I guess I need to simplify my opinion for some people
Fighting back =/= war