Because ragebaiting retards is fun. It's especially fun when the retards are also moralfags who are OK with trannyfaggot nonsense but draw the line at lolicon/racism. It is a filtering mechanism that exists solely to keep leftist and other undesirables away.
The loli shit isn't even the most complained about thing by those that hate Blue Archive, racism is. The chink that called ishowspeed a nigger and told him she's a nigger killer on his livestream was cosplaying a Blue Archive character. A character that never actually says nigger/nigga/niga in the game itself, but has a running meme of being extremely racist.