There is nothing arbitrary about the premises from which individual rights derive.
That's another opinion. But the fact is any premise you serve up can be dismissed as arbitrary by someone with a conflicting perspective. That's the major weakness of all philosophical systems.
But Objectivism does not, and the concepts are fully grounded now. If there were no real connection, then the philosophy would have been an abject failure.
Objectivism is an abject failure as a philosophy, which is why it's been relegated to a status somewhere south of Scientology in the credibility stakes. I'm sure there are a few dozen people somewhere who take it seriously.
If a Nazi walks around talking about how taxes need to be raised on the oil companies, and you agree, is it proper for me to call you out for Nazi sympathies?
A better analogy would be me denying the Holocaust. And I didn't say you sympathized with the Klan. Your constant habit of making things up does you no favors.