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