If your cats are eating wild meat, they will get worms. They will need dewormed especially if there are children or pregnant women around your home.
Feral cats are lucky if they live three years, our domesticated ones get at least four times that lifetime.
Kittens full of worms don't thrive, they can be a major issue in cat mortality.
Tom cats don't generally take food back to the tabby, usually the tabby is more concerned about him near her kittens.
Most cat owners don't want their pets predating the local wildlife; the RSPB consider cats to be the major cause of the decline in some small bird species.
cheers,
Toddy
Yes he does eat wild meat. He has done for the last three years, I was given this advice by my father who had cats before, one of which was a ferral cat from a work place bought back home to kill mice. (it took 6 men all morning to catch him! lol) His cats all lived 15-20 years so I have to say your wrong there. However I do get him wormed every 2 months as I know blood in birds can carry parasitic infection.
Treat your cat as you wish but I try and remember that he is still an animal and up until the last 200 years has been liveing quite happily without the need for vets, medication, special diets etc. Our ancestors never had any of that for their animals but they still had them and they still lived long lives.