I've got a very intersting book by Asimov about the end of life (A choice of catastrophes) which covers the risks of being alive. I suppose it's a bit dated, but in reality, we can be sure that we will be wiped out at some point or other. Top of the list are probably meteorite and cosmic gamma flash. All planets are threatened by these sorts of events, so yes, I agree. Even if a planet did sprout life, likely by far the most time of the planet's existence, it didn't. Let alone intelligent life.