Yet another reason why bots should always be cleared: the bot from 12.246.100.201 that stomped on about 30 pages just now was me. Even well-intentioned bots can cause significant damage if not treated with care. This one was my Wiki software test suite, which was supposed to be testing a new installation of the software on a machine on my local LAN, not the live Wiki.
Anyway, another observation: after stopping it, I came to fix the damage, and _I couldn't edit fast enough to catch up to the other Wikipedians who had already reverted all my damage_. It's nice to know the system is robust enough to recover from damage done even by its own developers. :-)