Why where we mad! [Wall of text sry]
Because it should have never happened in the first place. Its always a slippery slope. Its always the small things like a alt outfit or butt slap before games get banned, or put into "review" limbo in the case of Sony. Or Senran Kagura intimacy mode being removed. The continued bullying on Anime games by Steam.

And for the those that say just look at porn. Where not talking about porn this is a game and sexiness is not exclusive to just porn so why shouldn't be in a game or other media freely with the appropriate rating. Even then porn is being censored as well Patreon got rid of hypnotic content, loil and shota content gets taken down on other sites all the time, and a artist that had tentacle porn on Pornhub got the boot too. So go ahead and tell me that Slippery slope is just a fallacy. Ecchi games cant get bigger budgets and be come "quality" series when there not allowed to grow and exist as they are.

Tl;DR Should have never been censor'd and sexiness or just playful teasing (because thats all that butt slap is) should not be exclusive to porn.

"So go ahead and tell that Slippery slope is just a fallacy."
The slippery slope is just a fallacy, regardless of how much you want to believe otherwise.