Amicus brief is the life blood of the ACLU. In their case, amicus brief is the first stage in their intimidation practices (usually enough).
Yes, but usually they are attempting to actually HELP the person on whose behalf they claim to be filing, to win the case at hand. In this case, the brief — which was probably not endorsed by Craig or his attorneys — is clearly going to have the opposite effect, if any. If Craig knows what’s good for him, he’ll vociferously repudiate it. Aside from being idiotic on its face, it also essentially contradicts his official claim that he wasn’t attempting to solicit sex in the restroom, and that his “wide stance” was misinterpreted. Equally idiotic, but in direct conflict with the ACLU brief.