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There are additional issues... disease and parasite transmission from captive raised mice to the local wild population...
And the concept of a species regulating its own population based on limitations. If he isn't getting enough food then there either isn't enough food locally- and by keeping him half-fed you'd be keeping a predator alive where there is no prey... or he's for whatever reason unable to obtain it on his own, meaning he's weak. Be it an illness he was succesptible to, an injury of some kind or just an ectotherm coming off a tough winter; the breeding population depends on only successful animals being successful. Feeding a dud creates a population of duds.
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