I watched a HLN story on this case which they called a "hate crime".
It seems Clementi asked Ravi to have the room for the night. Ravi activated his webcam, viewing Clementi and another man. No video was released by Ravi.
Ravi made a public comment via twitter concerning the fact:
Two days later, Clementi, aware that Ravi had used the webcam earlier, asked again to have the room. Ravi granted the wish. Clementi blocked Ravi from using the during this encounter."Roommate asked for the room till midnight. I went into molly's room and turned on my webcam. I saw him making out with a dude. Yay."
The next day, Clementi committed suicide.
I fail to see a "hate crime".