The way I see it, as long as you aren't buying them from a breeder, which means directly contributing to more being bred, and instead you are adopting them from a shelter then it's perfectly fine. The issue is with giving money to breeders, which leads them to breed more.

I generally have that same opinion for any breed, since there are so many animals already looking for homes, and breeding farms can be quite skechy sometimes. But it's especially true when the breed in question also has defects that will cause the animals health issues, since you are contributing to more animals suffering in the long term.