One thing I appreciate about cons where the Dorsai Irregulars do security : they are always visible, clearly marked, and available. If you need to find security, they all have the same T-Shirts on, that clearly say "SECURITY" on them.

The fact that the Dorsai are also grown-ups, con veterans, and know the fandom(s) helps a lot.

That still doesn't excuse the behavior of the offenders, but I do notice that cons we've done where security is clearly marked and visible have fewer problems.