ARSo, why do you mix good arguments with poor ones? Take this:
“As Kol Yisrael areivim, if it means that we have to go out and get non-frum people to put on tefillin etc, why did not of the preceding Lubavicher Rebbes tell t cheir hassidim to do so? And why is tefillin more important than any other mitzvah? Why not informing people that they are not allowed to have tattoos, or any other of the many mitzvos that they unfortunately do not fulfill?”
It’s obvious that our generation is faced with a scenario that was not around previously. Lubavitch aren’t the only ones involved in Kiruv. For Satmar have an Ezer Labochurim in Hungary? Was there a Keiravtuni in “the Alter Heim”, or a Kesher Nafshi?
And so you seriously think it’s a good idea to do as you proposed, to tell people off for having tattoos?