Exactly because Art ignites passion. Like your comment demonstrates. Artwork both represents expression of humanity (artist & observer) but more broadly it's also a portal of the potential of existentialism. Of not just us (the self aware species) but the whole of our greater environment: The Universe.

The beauty of it too, is as you've pointed out.. that every perspective adds a different layer and it all then exists as very real content of human collaboration. Look at foodie culture for instance. The success of it is that it connects everyone. From high end to street food to home cook. From the chef to the chubby consumer to even the photo buff. One could even say food exists as edible art!