[Ekaros]

I think reasonable follow up for banning a party would be to automatically ban any party that even a single member voted in favour of the ban. And also bar any current members from those parties from holding up any elected role for rest of their lives.

Checks and balances. To ban someone you must be ready to fully give up your own political care. It seems just fair. This would ensure that bans only happen when people think they are absolutely needed.