When I'm out riding my bicycle, my view is that they are hoping I'll go in front of them so that they can have a better chance at hitting me. ;-)
The worst part of the practice is it is often unclear what their intentions are. Are they waving to me? Are they gesticulating to a passenger? Are they swatting at a fly?
I usually don’t consider that they are luring me into a trap but I suppose thinking like that can keep you alive on a bike.