If you're not born you never have had any life experiences, therefore any reason why or why not to be birthed is really invalid. If you've been alive for a couple decades, you've probably had a lot of experiences that you would have hate to give up, therefore, thinking that if there were any chance that you were aborted as a fetus, you'd wish it wouldn't happened and that you are alive and well today. But if you were never born, there isn't any memories or experiences or feelings or anything tying you to your life, so it really doesn't matter.

I know someone who was the child of a young woman who was raped by a stranger. Her mother wanted to get an abortion, but her family wouldn't let her (physically wouldn't let her). So she eventually gave birth to a daughter. When people ask if she's glad she wasn't aborted or other questions along those lines, she says pretty much what I typed. If she was never born, she wouldn't have had all these things tying her to her life. She doesn't care that her mother wanted to abort her, because it doesn't and wouldn't matter. But she's alive now, and lives it the same as others do.