JMIG,
I certainly agree with you regards the INFERENCE that the young man took his own life due to the perceived invasion of privacy, however inference and fact are two different things.
The young man appears to have taken his own life, we assume that as a fact. Anything regards motive, stated or otherwise is inference. Inference doesn't work in court.
Your example of the startled elderly driver highlights the effects of causality. Something missing from this disgusting episode. The driving example you describe is a continuous causal chain (series of directly events with no interruption) and an accident is a reasonable foreseeable outcome of someone startling an individual operating a motor vehicle. There is no break in the chain. Even then, the MOST the "kid" would be held for is manslaughter, and even that would be difficult (reckless driving would be far more likely).
Not so the suicide. The courts have regularly held that suicide is the result of an individual decision which others cannot be held accountable for. There are exceptions, but they usually involve an individual under medical care and perceived negligence on the part of the caregivers. This only makes sense if you think about it. People commit suicide all the time. Are we going to start charging their families, neighbors, co-workers for the hateful (or innocent) things they may or may not have said that may have influenced the suicide's thought processes? If a suicide is in a depressive state, it could be termed a form of madness, but that madness would not even come close to equating the legal madness such as holding everyone around them accountable for the suicides actions.
Of course you are right regards the entire incident. It was wrong pure and simple.