They do make hay with it, which is all the more reason for us to be sure we don't find ourselves allied with those who use legitimate issues like illegal immigration to cover their racist agendas. If we aren't diligent with it, then the Left gets to "make hay," as you say, and deflect the argument.
Yes, they're going to make that claim even when it is unmerited, but if they can confuse the issue by showing that we are buddy-buddy with those of doubtful intent, it works to their advantage.
The thinking person knows the difference.
As for this site, the founders can do I suppose about anything they'd like. It's theirs'.
That was my ultimate point, though I would add that they ALSO don't owe anyone an explanation. If you want to use their reticence to make the decision to withdraw financial support from FR, that is of course your prerogative.