This is an interesting ethical dilemma which I don't know if there's a clear cut answer. It's a variation of the trolley problem (sort of). I think it depends a lot on the risk assessment being made. I don't know the details of this particular case, but I can think of plenty of examples where a potential future danger should be limited by direct action. I'm happy to provide examples if you're interested in exploring this thought further. I don't know that I have a simple yes/no answer to this dilemma (also why I never became a cop).