Deterrent?

Dead men tell no tales. How will the tweakers spread the word?

Here's my suggestion:

Park a car at a launch, a nice one, maybe with an obvious tool box or something valuable in the back, plainly visible.

Get 9 or 10 guys together and lay in wait. You could even make a good time of it camping style with loaded film canisters and plenty of beer, as long as there's someone on sentry watching the bait car with a radio to let you know when someone takes the bait.

When the Tweakers arrive, jump their asses ambush style and take them captive. Might mean blocking their car in or holding them at gunpoint. When you have them strip them down, tie them up to trees around your campfire, douse them in gasoline and work them over with pick handles while you torment thier flammable asses with lit matches. Leave them to rot tied up like that.

Might want to wear masks for that kind of thing.