I'm not a DBA, and maybe you're not a DBA either, so this question goes to DBAs who may be reading: aren't you always better off killing the bad queries instead of rebooting the whole box, if that's an option? (ie: aside from times when the entire host is screwed, load per core is >50, metrics aren't getting out, you can't ssh in etc)
Guide to incidents: Step 1: Stop the bleeding Step 2: Prevent it in the future
Doing Step 1 doesn't make you incompetent.