Half of Hawaii's native birds are extinct.  Cats and mongooses are the main reasons.  Endangered Hawaiian monk seals, bottle-nosed and spinner dolphins are dying from toxoplasmosis which did not EXIST in the islands until ha'olies brought feral cats there.  Nene' geese--Hawaii's state bird--are dying so frequently from toxoplasmosis most of their species can only survive off-island in zoos.

Endangered hawksbill and Pacific green sea turtle hatchlings are destroyed by feral cats as soon as they emerge from their nests.  Just two years ago the world population of Hawaiian petrels was reduced from 50 to 48 by cats from a nearby "managed" colony.

If you want Hawaii reduced to a giant, flyblown litter-box festooned with invasive "tropical" vegetation, where all you hear is the incessant mewling of cats, and each breeze bears the stench of cat urine and feces, then let the cat-hoarding extremists have their way.  That's their idea of "heaven".  It isn't mine.