Its true, the autobots surrendering made no sense. And it made even LESS sense that Bumblebee would just sit there waiting to die after his hairy friend got blown away. Go out in a blaze of glory you fool! It was still cool to watch him kick ass when he finally pulled his head out though.
Especially when in the first two movies they establish Bumblebee as more of a bad ass warrior. Then you get more emotion shown over a robot that just shows up for a couple scenes in this movie getting blown away than an established one that was in all the movies.