Heinz vs. Castro and Willie
In this movie, the audience is "supposed" to detest Heinz and see Castro and Willie as heroes for shooting him.
The fact is, I found Heinz to be somewhat sympathetic - his crimes are crimes of passion, fueled by rage, which at least makes him seem human. Castro and Willie, in contrast, are cold-blooded murderers (they killed their teacher just for fun, and to have a day to play hooky) and hooligans (they destroy people's property for kicks).
If anything, it was Castro and Willie who should have been tossed off the roof, not Heinz (who should just have been put away in an insane asylum for a life).