I don't need to read your mind. I say it's arbitrary because it must be - as it would be if I made a claim about a certain work being propaganda, rather than merely having political themes. If I claimed that the movie Zero Dark Thirty was propaganda for the US military, that would be arbitrary, in the sense that it would be based on personal subjective appraisal. It is not a matter of objective fact or measure. I think there are cases when there is a very strong case to be made that something is pure propaganda, but I'm not seeing much evidence here.
So, I'm saying that what you're trying to do is put things into different categories, as if it were an objective matter, and that saves you from having to defend the more difficult and unpopular rightwing case about your problems with these particular influences.
With regard to the actual examples of games, that's one example of a game "partially ruined by SJWs". Can you think of a few more?