put it this way. If you said "HI" to her she might reject you,
but there's a significant chance that she'll say Hi back and you'd
get to know her.
Let's say you chat her up on the bus and she agrees to go home with
you and have sex with you that very day....what's the chance of
that happening?
Well it's still A LOT more probable than actually being able to
contact her here.