I don't really blame the Isaac fan base for being chill. Not that it obviously hasn't hurt us in the long run but it makes sense as to why this fan base hasn't been as loud as the likes of Ridley or K. Rool.
Isaac was an assist in Brawl. Before the bad stigma associated with assists was a thing. At the time, being an assist in Brawl was an honor, Isaac had his foot in the door, representation in Smash in some form. Maybe had Isaac not been an assist, the voices would have gotten louder for his inclusion. For now it seemed like Isaac being an assist, made him among top picks for playability next game.
Cue Smash 4, Little Mac gets promoted and Isaac's assist is nowhere to be seen. Nintendo even dropped Golden Sun port on Wii U out of nowhere. At this point I was waiting for Isaac to be revealed. I didn't think assists being cut would be a thing, it was only the second Smash game to feature assists. Then Nintendo released a Ballot for Smash 4, so our voices and effort went to voting for Isaac.
Ultimate was waiting for the pay off essentially. I did feel as if the ballot was the acknowledgement that Nintendo needed to see that Isaac was wanted playable, voting for him in a fighter ballot. I held it to a high standard. It kind of just felt impossible that Nintendo would cut his assist, see the demand for him in the fighter ballot, and then proceed to bring bring him back as an assist again, instead of leaving cut assists cut like the others. Yet Isaac is the special exception to the rule. So at this point, the salty backlash, yes it's yikes you never want your fandom to be embarrassing, but it makes sense given the journey this fan base has been through. This outrage was built up to this particular boiling point, in a the quiet kid can only take so much kind of way.