The better question is why were they using the car port? Most dashcams come with power adapters to plug into a standard fuse box and can be very easily routed through interior panels with basically no tools, no permanent modifications, and absolutely no expertise required.
Absolute worst case, a local garage will almost definitely do a fitting for less that £50 and it's worth it to avoid this exact thing happening.
Because people like to express themselves. Were social creatures. You'd might as well ask why hats or different coloured fishing rods are part of this fishing game.