As for suicide leading to Hell: Well, 1 John 3:15 says no murderer has eternal life abiding within them. A person who commits suicide is essentially committing self murder. Judas was called the son of Perdition. He was not saved. Unless of course you believe he was never saved (Which is a popular belief these days). Saul once had the Spirit of God and the Lord departed from him. A dark spirit had came upon him instead of God and he ended up committing suicide. There is no indication that God was in favor with Saul at this point at all. Also, Scripture says, "If anyone destroys God's temple, God will destroy that person; for God's temple is sacred, and you together are that temple" (1 Corinthians 3:17).
As for Samson: I believe the Scriptures teach that Samson did not commit suicide. Unless of course you believe Samson's strength was his own. Was Samson's strength a gift from God? Did God have to grant his prayer? Could not have God destroyed the temple and protect Samson against Samson's wishes? you betcha. So God granting Samson the strength to destroy the temple was God's choice and power. Not Samson's choice. Samson could not destroy the temple on his own power. It was only by the power of God that Samson could do so. Samson still did not really know how God was going to react if he destroyed the temple. Samson did not have a vision or guarantee that he could kill himself. God does not condone people to commit sin. God took Samson's life by the power of God working in Samson. In order for Samson to commit suicide of his own power, he would have to have absolutely zero help from God in his desire to die. In other words, Samson could have found another way to kill himself and the Philistines. But he trusted and relied upon God instead to see if God was going to answer his prayer or not. And God. NOT Samson was the one who ultimately took Samson's life because God gave him the strength to destroy the Temple and also allow him to be die within it.
As for Samson: I believe the Scriptures teach that Samson did not commit suicide. Unless of course you believe Samson's strength was his own. Was Samson's strength a gift from God? Did God have to grant his prayer? Could not have God destroyed the temple and protect Samson against Samson's wishes? you betcha. So God granting Samson the strength to destroy the temple was God's choice and power. Not Samson's choice. Samson could not destroy the temple on his own power. It was only by the power of God that Samson could do so. Samson still did not really know how God was going to react if he destroyed the temple. Samson did not have a vision or guarantee that he could kill himself. God does not condone people to commit sin. God took Samson's life by the power of God working in Samson. In order for Samson to commit suicide of his own power, he would have to have absolutely zero help from God in his desire to die. In other words, Samson could have found another way to kill himself and the Philistines. But he trusted and relied upon God instead to see if God was going to answer his prayer or not. And God. NOT Samson was the one who ultimately took Samson's life because God gave him the strength to destroy the Temple and also allow him to be die within it.