My guess on the hazardous SSPX chapel is that it's in Arizona.
At my old chapel, we had several police officers for protection. The place was (still is) in a really bad area. Latin Kings and MS-13 control opposite sides of the street. Nobody has gotten shot at Mass...yet. Nonetheless, the chapel has been broken into countless times. Removing gang tags from the exterior is actually a chapel "position." Cars have been broken into, items inside and car parts stolen on Sunday in broad daylight during Mass. A few years ago, the police cleared out an encampment of illegal Mexicans, about 50 of them, living in makeshift tents in the woods behind the church. In the summer, the place got so foul you could smell it from the back of the parking lot.
I once signed up for 4:00-5:00 AM on First Friday All Night Adoration. When I got out of car, an Hispanic guy wearing nothing but tattoos stepped out from alongside the church. I got inside and immediately locked the door and called 911. He was gone when the cops showed up, but they found a ratty pair of pants and flip-flops on the ground where he appeared from. There was also a pile of excrement with a few napkins from Burger King on top. After this incident, the pastor banned women from coming alone and from taking any hours after dark.
There is a strip mall two blocks down where they openly sell all sorts of drugs, people shoot up in public, obvious prostitutes turn tricks. It's illegal to conceal carry, but there are at least a half dozen or so who do it anyway. Last spring, ICE did a major sweep of the area after a visit from President Trump. They locked up about 100 illegals over two days. Eight are standing trial for murder, all gang related.
But if you ask certain Neo-SSPX supporters, they'll deny the chapel is in a dangerous area!
I haven't been there for other reasons since 2014. When able I drive 80 miles to hear Mass at a sede-chapel. I'm not a solid sedevacantist, but nobody really asks. And the chapel is in a very safe upscale residential community. Some people don't bother to lock their cars! Sorry, but I'm not that trusting! I grew up in Brooklyn in the 1960s and 70s, so I naturally assume even the pleasantest of communities have a few criminals in their midst.