Bumper quick release latches

[djct_watt]

Please excuse me for sounding extremely ignorant... I think I'm getting old and recent trends may be getting the best of me, but isn't your bumper held on by the clips and supports behind the bumper?

Are these decorative pieces or are they functional?

The last question would be regarding the rear bumper. I can definitely understand how a quick release would be extremely useful for the front bumper (give the tiny hood and engine bay). Why would you need easy access for the other end?

Again, apologies, as this is completely new for me and I really honestly have no idea what the heck they are for. I've seen hood pins, and those make a lot of sense (for some applications), but I'm at a total loss for these quick releases.