Its targets are mice and cats, where the latter are their definite hosts. Infected mice become less careful and thus are more likely to be captured and eaten by cats. The cat eating an infected mouse becomes infected and thus the parasites can mate and reproduce.
We as humans, are sufficiently close to mice to become infected as intermediate hosts, but we are a dead end, as we usually don’t end up as our cat’s food.
Not really, as the reproduction, i.e. the sexual part of their cycle, happens only in cats. But I agree, it doesn’t cause a strong negative pressure, as there are lots of spores being produced in the cats and ‘enough’ find their desired target.