so many good questions!
> drinking is a סרך איסור כרת?
surely, drinking leads to a lot of issurim. Read R Twersky’s books that our community is not immune to that.
> can be an example of drinking the way as appropriate for yidden
this is a good idea and is very convincing – especially after a couple of shots! Do I think that when I drink l’chaim (and my neighbor joins me) and then I stop (and he does not), that he will feel an urge to stop when he seems me _walking_ home – or he might still get into his car? Absolutely! (not).
> Fortunately, most who do drink, don’t drive and many don’t even have a car.
“Rov” is not good enough measure here. If we don’t do shofar on Shabbos because of someone who might carry it (even as the only ones without eruv are OOTers) – might think twice about drinking atmosphere that createsa permissive environment.
> We have to worry that those who wear a sign saying I don’t drink on purim/I don’t get drunk on purim,
you might live in some liberal enclave that I am not aware of. Discussion is not about signs “I don’t drink” but rather about NOT having signs “I am drunk”.
> It’s left a deep scar on his psych.
this is way worse than drinking.