I'd have to guess it isn't understood or they have no answers. The majority of the volume of questions I've asked in the last two weeks were answered with silence or rhetoric. Requests for proof - silence, rhetoric, and the usual unproven catholic line of claims and hearsay - nothing of substance. Go back and refresh yourself on the 2.5 threads of asking for One single piece of factual evidence that Peter was in Rome - nothing. I specifically said factual evidence - proof. Not claims, not conjecture or hearsay from disputed references. They gave me every thing I told them I didn't want to hear along with a barage of rhetoric. And still have not produced a single minute shred of factual evidence. They make the claim, I say prove it.. One would think I'd asked them to hack off an arm and feed a pet with it. The cries of foul and woe... unbelievable. If they'd been defending themselves against a crime, they'd all be in jail.
So what kind of evidence would you like? Frankly the Bible does suggest it in several ways and the testimony of early Church fathers is evidence. The only situation where it would not be considered conclusive is if there was evidence he died some place else. Since there is no other testimony or hard evidence that he died some place else we have by default only Rome as a plausible grave. Why should we not take the testimony of St. Irenaus(180 AD) who said "The blessed Apostles Peter and Paul, having founded and built up the Church handed over the office of the episcopate to Linus...." Against Heresies 3,3,3 This was the belief of all Christendom for a long time, we don't need to prove it, you need to prove that he wasn't there. Now you may not like the burden of proof, and you my say "Oh No YOU guys have to prove it!" but frankly no we don't. The evidence you want seems to be some thing other then writings of early Christians, I wonder what other evidence would survive? I suppose inscriptions in the Christian catacombs of Rome "Paul and Peter pray for Victor" Wouldn't be good enough either?
Now if you can't give us one single bit of "factual evidence - proof" that he did not die in Rome, why should we respond to you on that issue. If you can't you should drop it now.