I would feel sorry if american tourists would need a visa for europe, as the americans which do travel and get aroynd are the nicest people, first timers get to see the world from another perspective.
I prefer if americans travel for holidays rather than....forgive me...in military uniforms.
Its due to badly designed Miami airport compared to literally anywhere else in the world I've been, that you can't connect within 'safe' restricted zone after security checkin. No, you basically need to exit airport with all security involved (walk around checkins, go outside if you want) to get to your next flight, and walk throught all security again. At least luggage was transferred automatically, but most airports in undeveloped countries can manage that too.
Note that it's not at all unprecedented for US/Europe/etc travelers to be offered visa-free access without reciprocity for exactly this reason. The whole concept of "passport power" implies there are a lot of countries that give US citizens access without a visa without the US and other countries giving them the same.