A few thoughts:
First, a lot of the stuff we consider bad has a use within the ecosystem. They may serve as a food supply for some species. They may prey on a species who, without a predator, could devastate an ecosystem. They may have a symbiotic relationship with an important species. In general, the fields of ecology and environmental science can offer some answers to how these things are useful.
Second, these may not have caused any suffering for us before the Fall. In that case, only their benefit to the ecosystem would be known. We wouldn’t factor in the fact that they cause suffering, just that they serve a purpose in the ecosystem. The fact that they cause suffering is sort of on us.
Third, and alternative to the second point, suffering is considered to have value. Perhaps, for this reason, suffering existed prior to the Fall, but we would accept its good. In that case, we would see it as a good. (This point may not be fully in-line with Catholic theology. I’m not sure if we are allowed to believe that there was some form of suffering prior to the Fall.)
