Brain dead moral relativism argument. The question is whether eg. a group trying to scam elders out of insurance money or a Columbian cartel to hack local politicians to do blackmail, or South Sudan to hack Darfur or whatever, should be allowed to compete with the companies making products for their own exploits.
99.999% of people will agree that reducing software vulnerabilities is desirable if they're able to understand the question, including the bad actors themselves a lot of the times.
The situations like bad state actors are already not bound by laws, and things like keeping activism legal are better fought for through other ways