Because God is then creating people for the express purpose of sending them to Hell.
That is not the God I worship, full of grace, mercy and justice.
I have experienced those so focused on the doctrine of election that they felt it unnecessary to preach the gospel, given their belief that God would save them anyhow. They thus forget, “How then shall they call on him in whom they have not believed? and how shall they believe in him of whom they have not heard? and how shall they hear without a preacher? - Rom. 10:14. But, more to the point of this thread, in the previous verse we read, “For whosoever shall call upon the name of the Lord shall be saved.” The “Whosoever’s” of the bible insert a departure from man’s understanding of “the elect,” introducing an open to all view of salvation. How do we make these ideas jibe? I have often heard those speak about this using the imagery of a door into heaven, where, on the one side (facing mankind trapped in time and place) we read “Whosoever will” and on the other side of the door (having stepped through the door and into eternity), the glorified saint now reads “the elect of God” on the Heaven-side of the door.
To “over-emphasize” the doctrine of election (and I assert right now to any who might read here, that I say so with all humility and trusting that I am part of God’s elect, having received Christ as my Savior), to over-emphasize this point is to diminish (pervert?) the “Whosoever” aspect of God’s plan of salvation.
The first thing Christ did once He had chosen His disciples was to send them out into all of Israel with His message. One of the first things He told them upon His resurrection was to preach the gospel and make disciples of all nations. The last thing He spoke to them before His ascension into Heaven was to serve as witnesses of Him in Jerusalem and throughout the whole world. Election did not seem to be on the mind of Christ so much as “Whosoever will.”