God has a purpose for everything He does and though He certainly is not obligated to explain Himself to any of us, He does typically reveal His motives through Scripture.
Do you believe every single person’s life is valuable and worthy of being protected in the womb from the time they are conceived?
If non-Calvinists are wrong, what temporal or eternal harm have we really caused?
Calvinism teaches that God foreknows because He decreed that man would act a certain way, and thus man necessarily acts a certain way and God can be certain of that.
There is nothing contradictory nor deficient in understanding the biblical portrait of man’s knowledge being uncertain while God’s is certain