Is it coincidence that it is so common toxic people end up being the ones "carrying the project", or is it that because they are toxic, they push away other con

Is it coincidence that it is so common toxic people end up being the ones "carrying the project", or is it that because they are toxic, they push away other contributors and create a fragile project with a bus factor of one? Seems to me getting rid of those people sooner rather than later is better for the health of the project overall. Of course, I'm sure some will argue that it's no coincidence because being effective and being toxic are inherently positively linked, but that's simply untrue in my experience, wishful thinking on the part of toxic people who want an excuse for their behaviour. Linus himself has said he was wrong to act as he did, and has worked to change that, and seen improvements for doing so.