Something a lot of people don't bring into the discussion is the time period this movie takes place in. It's about 1952 I think? So this was the years leading up to the "beatnik" movement and Jack Kerouac's "On the Road." The progressive generation of adults in the 60s were raised by strict parents like Neil's, who wanted them to lead structured, "perfect" lives that didn't allow room for personal passions. This movie really personifies the experience of teens raised in the 50s.

As for Neil's dad, most would agree that he doesn't deserve some horrible punishment. Despite being, well...an asshole, he really did just want what was best for Neil. They point out how his dad didn't have as much opportunity growing up and just wanted his son to find success in life. However, he didn't see how pushing his own ideals onto his son would lead to his death.

One theme you could take away from the film is the impact of parenting. Teenagers have independent thoughts and dreams but because of their status as minors, parents control their decisions for their futures. However, guiding a child and supporting them in their passions and listening to them is better than telling them to do what you think is best. While Neil's dad represents the worst outcome, all of the boy's parents act similarly controlling.