system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are older Cubans so set against opening up of diplomatic relations between the US and Cuba?

Surely this improves everyone's lot and actually has a more positive effect on the attitudes in the communist society of Cuba? 

Is it just political sentiments or are there serious negative implications for older Cubans? Why are they so determined to make things difficult for US politicians?
gpt
They got run out of their home country by the current governemnt.

Cuba and it's government stand to gain a LOT more than the US from normalizing relations and opening up trade.

They want this oppressive government to fail so that they can have an opportunity to reclaim their country.

There is probably a lot of lingering resentment over murdered/imprisoned family members too.

That's the very rough and incomplete description of their possition.