No other perfect man loved. We needed someone to regain, what Adam lost. Romans chapter 5 verse 12 states:”.. just as through one man sin entered into the world and death through sin, and so death spread to all men because they all sinned.” Jesus death gives everyone that follows him and does God’s Will salvation.
God is a just God, and as such, His justice demands there be punishment for crimes committed. If someone killed your family, and came before a judge who let the murderer off free, what would you think of that judge? So God Himself paid the price for your sins/crimes, and mine, undergoing a most horrible and painful death imaginable.