Short blocks tend to be punitive, and are thus, in my opinion, in violation of the blocking policy. This is because (a) they cannot be intended for any purpose other than cooling down somebody (which never works) or (b) creating a permanent mark on a user. Neither of these purposes are effective or fair. Personally, I advocate for (a) no blocks, (b) long-term blocks, or (c) permanent blocks, depending on the seriousness of the situation.
—Thomas Larsen