I switched away because kbin seemed stuck and unresponsive to users and uncommunicative. Changes that were made seemed to be ones the Ernest wanted to and not addressing issues that people were feeling in some cases.
I am a software developer for a living and I can tell you that you can both have more people contributing and be secure. Most projects do not have bad actors who successfully poison things. When someone does, they get caught in the review process. If this is your concern, then prove that Ernest himself isn't a bad actor? I don't believe he is, but being one person in control would certainly make that easy.