That sort of hand waving does a disservice to history. Initially the embargo was enacted because Cuba nationalized industries without providing fair compensation (a).
It's true that the embargoes have been more ideological since then, but the ideology is that fairly basic human rights (life, liberty, free speech) should be respected (b).
All that being said, the Castros are pretty entrenched. Maybe healthier interaction with Cuba would promote human rights faster. But you don't have to make straw man assertions to make that point.
a) https://en.wikipedia.org/wiki/United_States_embargo_against_...
b) https://en.wikipedia.org/wiki/Human_rights_in_Cuba#Political...