It's not an ad hominem. I'm calling you a misguided weeaboo because the reasons you list for why they're wrong are wrong.

There are "alt-right" anime. By anyone's definition. You've watched them. GATE is one of them. So is Gantz. Terra Formars too(though that might almost reach parody). And there is much worse, much more blatant stuff out there. Most "alternate history" anime series have some significant degree of nationalistic pro-Imperialism themes and messages.

If you had said, "Manga has always been great because it freely chooses to do whatever it wants to do." I might have even agreed with you. But you said "Anime." Which isn't true. Anime is controlled by time slots, same as anywhere else. It gets away with "more" because most of it is late night (e.g. 12am-2am) or airs on satellite stations, or airs satellite stations late at night. Why do you think some series only air on AT-X?

Japan's Broadcasting Ethics & Program Improvement Organization gets complaints about pervy anime all the time too. Regardless of when they air or what stations they're broadcast on.

Oh, and got cancelled because it was blatantly racist.