When stocks are attractive, you buy them. Sure, they can go lower. I've bought stocks at $12 that went to $2, but then they later went to $30. You just don't know when you can find the bottom.
In the summer of 1990, I was buying stocks and I was probably three or four months early there. But we had a great rally in 1991.
The worst thing you can do is invest in companies you know nothing about. Unfortunately, buying stocks on ignorance is still a popular American pastime.
When even the analysts are bored, it's time to start buying.