So if you are using the "they shouldn't get into derm because they don't pay taxes" reasoning , and you are OK with outstanding foreign researchers (who don't pay taxes) coming in to take U.S. positions, why are you not ok with American's (who pay taxes) getting into those same spots. Is it because they happen to go to foreign medical schools, and you don't think anyone attending a medical school in the caribbean is good enough? That just doesn't make a great deal of sense to me.
Since you have extenuating circumstances that prevented you from gaining access to a residency that you feel that you are qualified for, perhaps could also understand that there may be (albeit non-geographic) extenuating circumstances that prevent a qualified student from gaining access to a U.S. medical school their first time around. Depending on which area of the country you are from, you may have a more difficult time getting into a med school than others. Some states have a lot of public med schools (NY, California, Ohio), that are traditionally state resident friendly. Others (North Carolina and Pennsylvania for example) have the majority of their spots tied up in Private schools that are much less state friendly.
Hundreds, if not thousands of qualified applicants get turned down for U.S. medical school spots every year. Some of these students choose to apply again the next year, and others (like me) feel older/more confident/read to take their chances in the caribbean and transfer back. Once again, going to the Caribbean, the Guad, Royal College of Surgeons in Ireland or Australia (all the routes that are traditionally considered by Americans) does NOT make you stupid. It means that you are determined.
If you yourself are content to take a somewhat-alternative route in finding a way into a dermatology residency(for whatever the reason), why fault others for finding a somewhat-alternative route of accomplishing their dreams as well.
Good luck and God bless you in achieving your goal. Here's hoping that we continue living in a world where everyone with strong work ethic(U.S., IMG, FMG, DO included) can accomplish theirs as well.