While ISIS is nothing short of pure evil, I would equate them more to the old-school KKK clans who murdered and lynched blacks and burned their houses and things of that sort. These white supremacists might not exactly fall into that category and neither would the group associated in that anaolgy in the crazy, violent Liberals lol. That might be a bit of an extreme.
Besides, ISIS' cause for destroying those statues was more of a fanatically religious stance and not so much that of a national identity. They viewed statues as a threat to the purely faithful (as if the truly faithful would be threatened by historical artifacts) and also that their presence is haraam. Egypt faced a similar situation by certain fanatical religious groups who saw the millions and millions of ancient Egyptian statues all around the country in the same light. No thought for historical preservation or wanting discourse on the subject of statues equating idols and leading to idolatry or even if they would be construed as haraam. Luckily they were shut down.