Over 150,000 souls die everyday and Castro was amongst them the other day

How we speak of tyrants today:
Pope Francis: 
On receiving the sad news of the death of your dear brother, His Excellency Mister Fidel Alejandro Castro Ruz, former president of the State Council and of the Government of the Republic of Cuba, I express my sentiments of sorrow to Your Excellency and other family members of the deceased dignitary, as well as to the people of this beloved nation. At the same time, I offer prayers to the Lord for his rest and I entrust the whole Cuban people to the maternal intercession of our Lady of the Charity of El Cobre, patroness of that country.
How a Pope tried to assassinate a tyrant not too long ago






And weren't we told by fellow Catholics that we had the duty to pray for Castor's soul?

Why?

Is it because he was a world famous mass murderer of his own innocent people? 

Do we Catholics have the duty to pray only for famous men?

http://townhall.com/columnists/humbertofontova/2016/11/26/black-friday-terror-from-cubas-current-rulers-n2250725