I'll agree that going to Roma-Lazio was stupid. I'd never heard of either team before going. The front desk at our hostel had two tickets that were going unused b/c the guests who ordered them were delayed getting into Rome so we took them, then found out the hard way.Roma-Lazio is the most violent, dangerous derby in sports. It's asinine to attend for anyone, IMO.
Perhaps on some level that's "cool." For me, anytime murder is a legit possibility, I'll pass.
If you want to root for Mexico...have at it. It almost sounds like you asked the question just so you could quasi-pontificate though.
As for MX, I was honestly not aware of the nature of the rivalry. I did know that the USMNT has struggled at Azteca. It's good to know but not changing my mind.