I don't think I can add that much that others haven't, but I've never been comfortable with the concept of cultural misappropriation. Not the concept: it's pretty clear, and I can see why it's a problem, but the way it winds up being discussed? Not able to articulate this well.

I think what bothers me is the idea that it can be a bad thing for ideas to mix and merge and grow and change and be adapted by different people to new ends. On the whole, it seems to be a very positive and natural thing for people to do (and far preferable to segregation and annihilation, the other alternatives when people with differing ideas run into each other).

So, as others have said, the problem seems to lie more with using the language/symbolism/imagery of a people to subvert their culture and/or oppress them, than necessarily with taking some of their ideas and doing something else with them.