Perhaps removing the informant from the field would be a less productive but legal solution to preserve their life?

I don’t think non-secret police has the right to overpass it’s rights even for any good with honest sentiment. How useful is a legal framework that can be trespassed in case of lives at risk, in a violent context where people get murdered?

We should refrain to call conspiracy easily but if I would be caught, "honest people doing their best" is how I’d try to defend myself.