The mirrors are designed to break away if bumped. In most cases they do just that, but the BRP version uses a kehole clip on one corner that can break if hit from the wrong angle or muscled off during the removal process. Once you learn the technique of removing and replacing the mirrors, they work pretty well.
To remove...while supporting the outer edge of the mirror with one hand to resist your other hand, rap firmly (but not too hard) with at the outer edge toward the rear to pop the front spring clip loose. Now put the support hand at the top of the outer edge and rap firmly upward to pop loose the lower spring clip. Don't hit so hard that the mirror wants to bend up at a substantial angle...you will break the keyhole clip. With the spring clips loose, lift straight up on the mirror about 1/2" to disengage the keyhole clip, then pull the mirror outward when freed. Pull the wiring connector out of the body, and disconnect it. Reinstallation is the opposite of removal. Make sure the spring clips are straight and parellel. Some light lubrication on the outer cone of the spring clip posts is helpful. Remember that rapping firmly usually works better than pulling or tugging, either for removal or installation.