And they sometimes get called "tankies" too by people to the right of them. That's why I both think it's a useless term (if everybody is a tankie, then nobody is) and why I think I fall in the definition (as most leftists do, I've seen pretty mild social democrats being called "tankies" by liberals)
Plus ultimately these blanket descriptions are pretty useless IMO, you'll find extremely heated debates between "tankies" themselves on many topics, there's no consensus, and there are many different ideologies "tankies" subscribe to. It would be like saying that Democrats, Republicans, Libertarians and Greens are all the same thing. We could call them "dronies" maybe.
The United states used military power to defeat the slavers in the south(and to get their independence in the first place), and the allies used military power to crush nazi Germany and their fascist allies. Not every use of military force is unwarranted or "immoral"