As Apple have proved this happens with ANY smartphone. So I think it's a bit harsh to say there response is crap.
I linked the video to the conference in another thread where they show the same problem on a Blackberry, Samsung & HTC.
This whole thing in my opinion has been blown out of proportion by the Anti-Apple brigade. They have chosen to just highlight the iPhone as having the problem and neglecting other phones with the same problem.
Putting the bumper on reduces the problem - that's a scientific fact proven by Apple and a no. of other tech review magazines. So I actually think its pretty good of Apple to give everyone a free bumper at a estimated cost of $183m to them. You don't see that from Nokia, Samsung, Blackberry, HTC etc.
You don't have to use a bumper you can use any case that covers the area in question.
Just my opinion of course.