Based on this outline, what is the most appropriate thesis statement for a paper about the cubist style of art?

There's not just one "thesis statement" and "argument" for cubist style of art.  There's a veritable infinity of approaches you can take here. The traditional stance is that cubist style of art revolutionized European painting and sculpture, and that it was a part of the avant-garde art movement. One less traditional stance would be that cubist style of art was essentially a creative cul de sac that didn't contribute anything lasting to European painting and sculpture.
Here's one thesis statement: "Cubist style of art - a pre-WWII style that still thrives today"
Hope it helps

Personally, i think the games do because it's actually them controlling it. this might cause them to think it's okay to do it for real. as for animated movies i think they are mostly fine because they're animated. also, animation has come a long way causing animated movies to become more real but 30 years ago this wouldn't be as big of a problem as today.