The fundemental problem is that if you get involved and whack one of the perps, you will be treated as a racist vigilante and persecuted to the fullest extent of the law. If you happen to get past those charges in court, the Feds will come along an persecute you for civil rights violations. If you want to fix this, fix the ridiculous courts. Good luck with that.
Not if you are stopping a violent forcible rape. I don’t care what grand jury you go in front of, you will not be charged. I would treat a rape in progress the same as a murder in progress or a stabbing in progress etc. Full deadly force, no warning, no nothing. Baseball bat to head, shot to head, whatever it takes to make the mad dog stop like right this second, not the next minute. And at age 80, even less reason to hesitate, since the tables could be easily turned by a young violent felon committing a heinous crime that could get him locked up for 25 to life.