They won't necesarily eliminate each other, although it is fairly inevitable that some idiots will join just for the reason to cause trouble.
I agree that making everyone who joins an admin is a bit counter-productive though. In groups where the group is actually a real life club that only allows players to join who are actually members of that club, then I think it's a good idea to let them all have admin roles. In a normal public group though it defeats the purpose of a command/control chain, it's comparable to making every soldier a general.
Everyone who join gets to be an admin??
Only one driver on time! or it will be conflict of interests, and lost of general direction...
Help can be done without all be on Admin!
If someone cannot manage own Group, he must consider it as own failure and lack of skills! Quit!
Greg
by AWARDCHESS