If chainsaws were used in a mass killing, should we ban chainsaws? Or how about scissors? Saying police and government agencies "need" to have master keys to e

If chainsaws were used in a mass killing, should we ban chainsaws? Or how about scissors? Saying police and government agencies "need" to have master keys to every building, network and endpoint is insane. This is the fascist Clipper chip redux. The potential for abuse is beyond the pale for an open society. As such an open society must accept some edge-case vulnerabilities (ie criminals using crypto) in order to avoid becoming a censored, totalitarian fiefdom where dissent is crushed by the wide powers of intelligence services that have a panopticon into everyone's lives, 1984-style.