Possums are not dangerous. Yes, EPM is spread by their feces. It doesn't mean every possum is the carrier. It's not any different than the possibility of catching rabies from a rabid animal. Oh yea and deer tend to spread ticks that can cause Lyme disease. It doesn't mean that I am going to kill every skunk, raccoon, dog, cat, bat, deer, etc that comes to my yard. Do some research, if there are recorded cases in the area you have something to worry about.
I live in the country and we get so much wildlife here. We have dogs, so I try to relocate critters that come to my property. I for sure am not going to sit outside and shoot every living thing out there...just in case. That is so ignorant!