I assume this is sarcasm. Calling North America (and some European) countries universally safe is pretty comical. Very few countries are safe to everyone.

If you really wanted to clear the backlog, the opposite approach would make more sense. Mark many countries as unsafe and let most people from there in. That's not a great idea, an individualized approach makes more sense of course. Most regimes tend to target specific minorities rather than everyone (or they'd have no one to govern), so if you want to limit the amount of immigration (a big "if") then you'd want to start there on your acceptance criteria to pass people easier, then consider case-by-case for less clear cases, like activists etc.