Because they are the good guys of course :-) Almost all triple A games are made in the US itself or allies (UK/Canada/Japan/EU) so it’s expected these games will have a positive view. Same reason it’s true in Hollywood. Most people just want to get on and have fun with a game, not overthink politics and ethics and I don’t see it as an issue. The more annoying thing is when you’re nudged to know random guy is evil due to generic Russian/Middle East accent.