People died under the Batista regime, people were dying throughout Latin America, due to the injustices and inequality of US led regimes. It doesn't take much research to see how the Batista regime operated.
Prosperity was uneven. For the sugar cane working who was unemployed half the year and discouraged from finding other employment so as to be available when the plantation owner needed him, life did not improve. Even though Cuba had the fourth highest standard of living in Latin America, that was not high. Besides, Cubans compared themselves to the US not Honduras or Bolivia. Illiteracy was high; schools too few; affordable medical care almost impossible for the average person to get; and housing substandard. Rural areas suffered more than urban areas because Cuban presidents had always feared the cities more. In short, social justice was a victim of the Batista years.
Whilst the Batista regime was prosperous due to sugar, this did not find it's way to those that needed it. To put it bluntly people died.
Guevara witnessed first hand the death of children, purely because of lack of medical treatment under US led governents throughout Latin America. At the end of the day killing is killing, murder is murder. But if you're going to put Guevera in this light, do it the context of the thousands, if not hundreds of thousands of deaths led by US backed regimes throughout Latin America.
History has shown and continues to show that continous US governments finds it a necessacity to get involved in other countries affairs, for their own interests. If revolutions and in turn deaths are the response to this, it should be of no surprise.
Paul