Build a tree, cut the tree at the first link, now you get rid of all of them. Will have some collateral damage though, but maybe safe to assume actually "good players" can rejoin at another maybe more stable leaf
That does not work because you won't have multiple parties vouching for a new entrant. That's the whole reason a web was chosen instead of a tree in the first place. Trees are super fragile in comparison, bad actors would have a much bigger chance of going undetected in a tree like arrangement.