Why does it always go the same way?

A bunch of people carefully build up a community or project with sustainable growth through a lot of hard work...

Then someone (generally not part of that group) gets impatient, declares that "it will never work this way", starts adding and inviting everything that people don't want into the community to "grow faster"

... and in the process wrecks the whole thing, and then usually the next step is for people to loudly declare "see, that one guy was right after all, it didn't work", and zero thought is given to how "that one guy" actually *caused* it to fail, and instead the original group is blamed, the people who put in all the hard work

I am so, so tired of this dynamic