So what? If you have 100 children, it's OK to murder a few of them, is that your argument?
Consider tsunamis to be accidents, uncontrolled events of tectonic plate movements, , movements that also are co-responsible for abiogenesis (remember the deep ocean vents)? I expect my kids to be smart and not to be so copulation irresponsible that they have to,- again and again expose themselves to accidents that happen again and again. The purpose of life is to keep it going, and for me to see what develops, how far my kids can push the envelope, safely.