How did Stalin became evil?

Answer 1

*he mass murdered millions, sent thousands of kulaks to death camps, killed anyone in his way to achieve his goals, deported millions, sent thousands of German civilians to work in Siberia*

No, Stalin was not evil, and his horrible crimes is mostly falsification or oversizing. For example, most modern historian change sentence "thousand of people was sent to jail for thievery" to "million of people was sent to Death Camps!". Practically, Stalin did his best to help people of Russia. Without his leadership, may not become strong and fend off Germans.

And, of course, no German civilians was sent to Siberia. German prisoners of war were sent to jobs on rebuilding nonmilitary facilities, destroyed during German invasion. Of course, most of this facilities are in western part of USSR. I personally lived in Moscow in house, which was built by German POW. It's a good house, may be old, but built well.

Answer 2

It is said that at the grave of his first wife (Ekaterina Svanize) Stalin told that with her died any human feeling in him.