You could almost say this of Daesh even a few years ago, when they kept their antics mostly confined to their own territory. You'd still be wrong, because that argument requires you to ignore both the sheer enormity of the things they do to inside that territory and the blatant expansionism they practiced and continue to practice, but the argument could at least be considered semi-reasonable.
But that was before they started going after their own refugees: people who were outright running away. Quarrel or no, they posed no threat; indeed, posing no threat was, for many, a driving factor in their decision to leave. And if Daesh are willing to do this to refugees, then the only even half-baked argument left for calling them anything but pure evil is gone now. It is time to accept that we are dealing with the Nazis of our time, and treat them accordingly.