Hmm, I suppose we could possibly make progress here.
I would counter your assertion above. I propose that a white-only restaurant in the middle
of a black district will cause conflict. Do you seriously think that it wouldn't piss people off?
What about when some Klansmen walk along the street to go there, perhaps with a noose and burning cross?
Don't you think that would almost certainly cause conflict?
To avoid any stereotypes, let's invert, and thus possibly subvert, your scenario:
"I propose that a black-only restaurant in the middle of a white district
will cause conflict. Do you seriously think that it wouldn't piss people off?
What about when some Panthers walk along the street to go there, perhaps with brass knuckles and shotguns?
Don't you think that would almost certainly cause conflict? "
Hmm. In either situation, the problem can be completely avoided by not selling to the white/black person in the first place, but let's assume that the previous property owner was a moron, and didn't ask what the property was going to be used for.
Assuming that, and the business does indeed get started, remember that all the other property surrounding it, including the road up to it, is private as well. The road can, and indeed should, exclude troublemakers from traveling it. Simple things, like requiring any fires in the vehicle to be extinguished, etc, should do it. Come down to it, the street owner can just shut down access to the restaurant completely, if the place is causing that much trouble for the neighborhood.
But let's assume the road owner is a neutral party, far removed from, and thus uncaring about, the 'conflict' brewing. You're assuming that people have the right to not be offended. You're wrong. A white man, carrying a cross and wearing a hood is harming no one, just as a black man wearing a leather jacket and carrying a lead pipe ain't hurtin' nobody. As long as those things are true,
there is no conflict. The minute that black man swings the lead pipe at someone though, or the white guy grabs someone to string up, then there's a conflict. A conflict that can be resolved using one of the three methods I presented in my previous post.
But really, your whole scenario is stupid. Who would go into Harlem and open a Whites-only restaurant? You'd get no business. You need to cater to the clientele most likely to come to your store. In Harlem, that's gonna be blacks. And as for racial tension in general, Talking (ie negotiation) has proved to be the best way to defuse it, every damn time.