A condom breaking is a rare occurrence, but it does occasionally happen.
Let's say your condom does break... Would you want your partner to be someone that practices safe sex, or a sexual kamikaze?
That's why it's so important that everyone in the hobby practice safe sex each and every time – and that we avoid anyone known for barebacking.
Everything in life poses a risk, but we can drastically reduce our chances for problems by being as diligent as possible about safety.