Why does the media ignore the criminal past of Communism?

It seems more and more Western leaders are going to Cuba to prostrate themselves at the feet of the ruling dynasty, the Castros. UK Foreign Secretary Philip Hammond went there on April 28, about a month after US President Barack Obama paid obeisance.

Which raises the question of “why”? They hardly need Cuba’s vast wealth, which is non-existent, it being one of the poorest countries in the Western Hemisphere, with more than 10 percent of its population in exile according to Cuba Archive, a reconciliation and memory website. So what explains this strange behaviour?