Perhaps that's because the Cuban people have seen the same script play out twice before, whereby the Pope visits Cuba, coddles the Castros, leaves and all remains the same -- with a bunch of new dissidents arrested.
Ironically, the Obama Administration argues for engagement with the Castros -- yet three Popes have kowtowed to the Castros with no success.
Perhaps they should change tactics and instead cast their lot with the oppressed and downtrodden.
For "the Lord is a stronghold for the oppressed, a stronghold in times of trouble." Psalm 9:9.