Shooting people is not illegal in the US -- I'm not sure this is the best analogy or there will be huge limitations when discussing decompilation efforts.
Plenty of people are shot or killed lawfully with firearms.
I doubt that will happen for a tool with an arbitrary usecase of assisting in research however some projects related to reverse-engineering have been censored under the DMCA takedown regime.
Plenty of people are shot or killed lawfully with firearms.