No, I absolutely would not help a loved one achieve some sort of extrajudicial punishment, I would instead strongly recommend against it. I would try to comfort and support them, responses that are helpful regardless of how good or badly I personally judge their case and related punishments. I would tell them that perhaps the justice system has failed them and no system is perfect, but vigilante justice is a terrible and unproductive response that breeds more injustice than it resolves.
The way you fix loopholes in the justice system is by fixing loopholes in the justice system. The justice system is governed by laws developed by deliberative bodies held accountable through democracy. It's not pretty and it's not satisfying, but after centuries of gross injustice we should know better than to trust mob justice.
Nope. Neither. I may or may not stop associating with the perpetrator, all things relative to my perception of how bad the thing they’ve been accused of was. I might mention it to mutual acquaintances and let them decide how they want to deal without any judgement on my part.
Trying to get someone fired / hurting their livelihood in general seems quite childish.
I try to mind my own business. I don’t snitch on anybody if I see them doing something wrong. I don’t join online mobs or rage on anybody.
If some adult I knew said “so and so made me feel really uncomfortable 2 years ago” or “so and so touched me 2 years ago” I’m not going to say “hey let’s get them fired!!!”
It’s not my place to be a vigilante. I wouldn’t get involved at all. If I had a good relationship with the accused I would probably even help them out, eg hire them, after someone “cancels” them.
For example, imagine a scenario in which a loved one comes to you and says they were sexually assaulted two years ago. It happened long enough ago that there is no hope to recover any corroborating evidence. It will simply be the victim's word against the perpetrator and therefore there is almost zero hope of conviction. Do you tell this person "just trust the judicial system" or would you help them achieve some sort of punishment outside of the judicial system such as getting the perpetrator fired?