In a court of law, the judge can rule a witness in contempt and have him jailed.
If a witness in court tries to do this—let’s say he somehow gains the physical power to overcome the bailiff and other officials, and is able to put another witness in jail after first accusing him of contempt—his actions nevertheless have no legitimacy because he lacks the legal authority to do this.
So here you can see the point. Jesus has authority and jurisdiction over life itself. This defines Jesus’ death as categorically different from suicide.
Samson humbled himself and prayed to God to give him supernatural strength for the ultimate purpose of bringing justice upon the Phillistines. His purpose was not to end his own life. A man like Robin Williams committing suicide is not humbling himself to God and asking God to work through him. A man committing suicide is acting only according to what he perceives as his own selfish needs and only according to his own perceived autonomy.
He is stealing from God authority and jurisdiction over life. It’s equivalent to blasphemy. This is where the difference lies. Ok, so you have some differentiating principles; in order to win you need to (a) formulate them into a definition, and (b) show how the definition I've been using is inadequate or wrong.
[Just (a) would be a stalemate.]
Although my temperament is highly inclined to debate for my own sake, I know this is wrong.
If a person chooses to believe other than truth, their choice defines itself.
I have enjoyed speaking with you, and you have helped me to think more clearly about these things.
The Good Lord is victorious first, and we through him.
Jesus Christ is the truth.