As others have said, but it deserves repeating: If you need magnification to get on target, then it's not a wildlife defense situation.
If you happen to have a magnified optic on your hunting rifle that you are using for wildlife defense, then that's a different issue. It's not ideal, but it is very common (hunting in bear country, etc.).
Absolutely, a closed tube design is the way to go with a red dot for this application.
You'd be hard pressed to find a typical wildlife defense firearm that allows co-witnessing irons through an RDS. Not impossible. But not worth it, in my opinion, with something as high quality as the Aimpoint you recommend. Replace the battery every year on your birthday, and you're fine.
If you happen to have a magnified optic on your hunting rifle that you are using for wildlife defense, then that's a different issue. It's not ideal, but it is very common (hunting in bear country, etc.).
One thing I haven’t seen mentioned regarding red dots and specifically open ones like the rmr is exposure to rain, ice or snow and what can happen when the lens is wet.....
Absolutely, a closed tube design is the way to go with a red dot for this application.
... allow for cowitnessing of iron sights. ...
You'd be hard pressed to find a typical wildlife defense firearm that allows co-witnessing irons through an RDS. Not impossible. But not worth it, in my opinion, with something as high quality as the Aimpoint you recommend. Replace the battery every year on your birthday, and you're fine.