Unless you are religious and believe in eternal torment after death, death isn’t cruel, it’s simply an end to life, a permanent return to nonexistence no more or less cruel than having never been born.

Additionally, while they aren’t exactly wrong in that going from nonexistence to existence results in an infinite increase in potential for suffering, that holds true for joy/happiness/pleasure.

Imo bringing someone into being is not cruel nor wonderful, not moral nor immoral. It simply is.