The worst thing about ebikes is not the unproven impact on trails, not the speculative impact on public opinion about bikes, and not the potential complications for trail access.
The worst thing is the self-indulgent persecution complex of some people that push for ebikes...the ones who have the nerve to compare a bit of critique to some sort of ethnic cleansing. I don't care much for the anti-ebike trolling either - they're helping nothing. However, hearing some grown adult boo-hooing about some decal mocking ebikes and trying to compare his experience to that of bullied children or persecuted racist groups is just plain pathetic.
The real difference between eMtbs seeking legitimacy and the original MTB movement is that of the generation in which it occurs. Today, to many social movements are simply some big race to claim victimhood...to prove how you're unfairly treated by others...it's bad enough that you have people actually comparing a bit of critique of their sport to the oppression of human rights.
FFS - a bit of ribbing is not oppression. Being called a motorbike?! Does that really hurt the soul? affect "your people"?
If they really love their eMtbs so much, they better toughen up a bit. Maybe spend less time taking engaging the trolls, less time trying to compare their plight to other things (i.e. MTBs in the 80s, snowboards, paddleboards),......
....and just do some proper trail advocacy.