I'm going to cut in front of people who jumped the line
Why do you want to cut back into line?
I would cut people who want to go first in a queue or people that go first into a lift.
I think it would make more sense to just tell them to go to the back of the line and call them out on it. That way they learn but you aren't also doing anything wtong.
Why should I go against myself?
Cutting in line is never correct, no one will understand the full scenario. Try to stay in your spot and call out anyone who cuts to security. Eventually the line will fade and you'll wonder why you bothered.