F'n Kerry's good at that sort of 'diplomacy'. Remember his Paris 'peace talks' during the Vietnam war?
"Why in the world are former or would-be US Presidents allowed to go around the world sucking up to dictators?"
IMHO when Jimmuh, Bubba and sKerry do this they are actually giving us a peek into their true selves and the people the type of people they more closely associate with.
At the root of all the dictators you ticked off there is one underlying bond...Socialism/Communism.
And, in it's current form, modern Lineralism, which Jimmuh, Bubba and sKerry represent, is just another branch of Socialism. So it's no surprise to me that these three seem to enjoy their company.