As others have pointed out, I think this might be a slippery slope. I like the idea, but I think there will be situations where being the arbiter of what is considered acceptable/unacceptable will be very difficult to justify.

Say, for example, that you've written some code, and for some reason, the resistance movement against a vile dictatorship needs to use the code you wrote. The use of it, will also mean people will be harmed/killed, but so will not allowing them to use it. What standards/guidelines would you have to use, to make it acceptable to waive the license restrictions on the software in that case?