

I would point to construction cranes as a case study in favor of mechs. At its core, a crane lifts loads heavier than humans or even teams of humans can manage. But as they are, they’re kinda slow and are finicky, requiring great care and slow operation.
If you had a mech, moving the raw materials up would be no big deal. Although one could argue that outfitting a crane operator with equivalent dexterous control of a crane would enable similar improvements, but in a smaller, stationary footprint.
I don’t see any inherent contention between the two examples you’ve given. Someone that is justice minded is looking for two things: 1) a system that punishes those who commit wrongs, and 2) a system that only punishes those that meet the criminal criteria.
It is a colorable argument that health insurance executives ought to have culpability for their decisions, yet the legal system allows them to skate. It is also a colorable argument that some/many/most prisoners sentenced to death in California were wrongfully convicted, or their trial/punishment was swayed by improper bias (ie racism), and thus such an imperfect system ought to not result in irreversible error (ie execution of someone who didn’t meet the criteria).
Please do not reduce nuance into nullity. There are vanishingly few people that will assert that killing (even self defense) should always be prohibited; this is a strawman. And “internet vigilantism” is more than just words on a screen, but actions undertaken that happen to be online. Take, for example, the good work of DDoSecrets, which is unquestionably a form of vigilantism, yet daylight is the best antiseptic for corruption. The world is not black and white; rather, it is complicated.