the decorum there was somewhat relaxed
Well, that's the problem, isn't it? Environments that feature such "relaxed decorum", such as touring companies, casting rooms, pageant dressing rooms, senate offices, fucking Alabama (including its shopping malls) ...
Decorum is a sum of activities considered permissible in a circumstance, and "relaxed decorum" is generally a male-induced set of parameters for behavioral acceptability that have historically included a set of behaviors that have recently become "no longer acceptable", regardless of circumstance.
If you want to let Franken off the hook because his behavior was more acceptable when he did it than it is now, well fine. But you have to give Cheato and Moore the same leeway, and considering the climate of 1970s Alabama, semi-kidnapping a 14 year old girl and whacking off in front of her, was probably in violation of "acceptable decorum" there and then, about as much as Franken was in violation of "touring company decorum" when he groped Tweeden. (That's how backward Alabama really is.)
Franken, Moore, Cheato... They should ALL step down, go home and think about what they've done for a couple of decades. By then the pendulum will probably have swung back in their favor. And Cheato willbe dead, so the problem will be somewhat less urgent.
</sarcasm>
Don't get me wrong, I despise molesters of both political parties. And I despise the unrepentant ones the most.