Ok so in closing. If you take the wild rodents and use precautions to eliminate the risk of poison and aggression you would still have the parasite risk. The parasite risk would be greater because wild rodents have a greater chance to carry them. Sound about right?
Basically yes. It's still a huge risk, but that is the most basic way to put it... But one must also consider the internal parasite thing as well, though that would be going along with your last sentence. Still a huge risk though.