[Avodah] Inviting Someone On Shabbos Who Uses the Eruv, when You Don't

[David Riceman]

My previous post may have been too terse.  I hope you'll pardon more 
prolixity here.

RMB:
> I would like to say that the real cheit is actually the crime of neglect
> implied by forgetting, not the act done beshogeig.

I think you've neglected an important hilluk, which RHM cites RAS as
having made:

RHM:
> Rav Aahron Soloveichik held that anyone who uses the Chicago Eruv in
> West Rogers Park is being Mechalel Shabbos D'Oraisa B'Shogeg. And that
> those who gave a Hechsher to it are Machti Es HaRabbim B'Meizid.

In words, there's a distinction between professional rabbis, who ought
to know the halacha even when it's convoluted, and normal people, who,
in practice, may not have the time or ability to learn through all the
sugyos by themselves.

Arguably professional rabbis have a responsibility to review hilchos
Shabbos every Shabbos, and you might be able to argue that neglecting
that obligation induces a new shegagah. I don't see how you can say
this about RYL's friends, whom he portrays as relying on poskim rather
than being poskim.

David Riceman