Because the God Created Men
One of the main issues in the Gospels is love.
According to those Bibles, the God represents good, which means love is linked with good.
Due to God's love for men, men were created and can live. This love by God must include good but does not include evil. Therefore, it is natural that God and Christ Jesus request good from men. And, it is natural that only good men are admitted into Heaven.
So, for children to grow and live, good and love are needed. It must be similar to the condition where the God created men from His love to them based on His good.
Heaven means pure good while the hell means pure evil. Put extremely, each man must choose pure good or pure evil as his/her ultimate target. However, in the human world influenced by Satan, the better one becomes, the more he or she is attacked by Satan and its followers. For instance, we may interpret the Gospels as stories where one extremely good man, namely Christ Jesus, was attacked and killed on the cross by followers of Satan, namely religious leaders and Roman soldiers.
Even today, none can live safely in peace if he or she honestly and strictly pursues justice, universal love, and social and individual good. People often think that circumstances may justify a lie or the end justifies the means. So, any human society is infested by evil. And, Satan dominates the human world.
But we must not forget that it is not Satan but the God that created this universe and men. And we must believe that the God created this universe and men due to His love for men based on His goodwill to men.
However, it is still a mystery why the God who is perfect and all-powerful loved to create men out of good intentions. But we may also think that Satan could find a chance to attack the God through influencing or attacking men, God's creatures, because the God created men.
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M'r:12:1: And he began to speak unto them by parables. A certain man planted a vineyard, and set an hedge about it, and digged a place for the winefat, and built a tower, and let it out to husbandmen, and went into a far country.
M'r:12:2: And at the season he sent to the husbandmen a servant, that he might receive from the husbandmen of the fruit of the vineyard.
M'r:12:3: And they caught him, and beat him, and sent him away empty.
M'r:12:4: And again he sent unto them another servant; and at him they cast stones, and wounded him in the head, and sent him away shamefully handled.
M'r:12:5: And again he sent another; and him they killed, and many others; beating some, and killing some.
M'r:12:6: Having yet therefore one son, his wellbeloved, he sent him also last unto them, saying, They will reverence my son.
M'r:12:7: But those husbandmen said among themselves, This is the heir; come, let us kill him, and the inheritance shall be ours.
M'r:12:8: And they took him, and killed him, and cast him out of the vineyard.
M'r:12:9: What shall therefore the lord of the vineyard do? he will come and destroy the husbandmen, and will give the vineyard unto others.