I don’t think people question adaption, or variations to climate (as in races of people, but we are all still the same species even with different features adapted for different areas of the world).
It’s the species jump that confuses most, including me.
Such as?
How many species of fungus gnats do you suppose there are? Does it confuse you that a fungus gnat could evolve from a fungus gnat? ( The fungus gnats are a family, and in Peterson's Field Guide to the Insects, each family rates a single entry. )