Bad Drivers? Inexperienced drivers??

So what is it about merging that people do not seem to know how to do? It's really simple if you think about it, traffic merges from the right and traffic takes turns letting the cars merge in. It's just that SIMPLE. However this is not the case as viewed today and really any other day. You either have people in such a hurry to get to their destination that they speed up not allowing a car to merge, as if one car makes a big difference at rush hour, or you have people unaware of how a merge works and follows the lead car at a steady pace, not slowing down to let a car merge.

What could the reason for this be? Do people actually not know how a merge works? Do they think the sign is posted just to let them know there is a "hidden" street approaching from the right even though the entrance is in plain view? Or are people so inconsiderate of one another that they don't give a crap and prevent others from merging? Whatever the case is, I think people should go back to drivers ed 101 and learn the basics because if you don't know how to do something as simple as merging you should not be on the road. Just my 2 cents.