Reddit has come forth saying they will not tolerate mods that try to destroy communities like it happened before. If a mod deleted their account, someone else will take their place. If a mod deleted a popular subreddit, Reddit will restore it and ban the mod. Deleting their account does literally nothing.
Speak for yourself. Speaking up against what one perceives as wrong and distancing themselves from it is absolutely relevant. Using your logic, you might as well "not vote" because "1 vote out of millions is kind of irrelevant".
Communities become ghosttown shitholes when the moderators work against good faith discourse.
Not the same day new shill mods are installed, but within a few months. It poisons everything.
Banning the creators/mods of a sub is banning the people that care most about that sub, and tends to lead to installing mods that are just looking to flex power, which makes the posts and discourse toothless, repetitive, and uninsightful, which makes regulars look for a new home, if they themselves are not banned for failing to regurgitate the only correct opinions as endorsed by the new mods tasked with bringing order.