First, I think the word or concept of damnation must be clarified. When the biblical scriptures refer to eternal damnation it means a separation from God the Creator; the only Source of love, light, peace, joy, beauty, and everything we consider good.
Secondly, I think God created the human race as a whole, not separate individuals one at a time. So although God knew there would be those who reject His offer of eternal love, many millions and millions would accept and live with Him in a glorious eternity. Those millions would be sons, daughters, cousins, aunts, uncles, brothers, sisters to those who also had the opposite, but chose to reject. For God not to create those who refuse to be with Him and end up separated in eternal damnation, would mean then no creation of those who choose eternal life and love. Because, as I said the human race is one, everyone connected one to another.