Sure, why not? Vampire bats don't cause much harm to humans really. Sure, they feed on large animals and humans, but look at us, we eat other animals as well and some cultures even use the blood of other animals in their cooking. That's just the natural cycle of nature. Therefore, I see no problem with the stabilization of vampire bats.
Bats make important contributions to ecology, the economy and even to the search for new technologies.
The ecological roles of bats include pollinating and dispersing the seeds of hundreds of species of plants. For example, bats serve as major pollinators of many types of cacti that open their flowers only at night, when bats are active. In addition, bats eat copious quantities of insects and other arthropods. On a typical night, a bat consumes the equivalent of its own body weight in these creatures.
Pooring money into research for something that nature will take care of by itself is something that the government seems to do best. Most likely, millions of dollars would be spent before the government finally "confirms" that there's actually little to nothing that it can do to "stabilize the existence of vampire bats." If there is an overpopulation of any sort of predator, they always die off until there is a stable ratio between predators and prey.
While it seems to be a noble cause to want to try to save different species on the planet, America has a staggering national debt and needs to curb its programs to avoid debt getting out of control. It should focus first on programs that the American public needs the most like health care, Social Security, and national defense.