Yeah, excluding toxic individuals is very important goal. That's why it's also very important to seriously think about the mechanism which is used for kicking out toxic people.
The mechanism might be too weak and not be able to help the community. Or it might be too strong and end up excluding many good individuals.
I'm in favor of trying different mechanisms in practice and watching if they work as intended. If not, then they must be adjusted before the toxicity spreads too widely.
Human nature is to treat any attack as toxic, valid or not. Not possible to eliminate toxicity, just like not possible to eliminate common cold. As much as want to attack toxics also have to improve our own resiliance to common cold, criticism, biased and blinkered thinking.