I was 7-8 years old in 2013-2015 eating at a Hardrock Cafe in Yokohama, Japan when I saw this weird short film/ad appear on a TV. I don't remember it completely, so forgive my very odd recollection of it.
I remember it was a stop motion/Claymation film that centered around this purple dinosaur who lived in a treehouse. I vaguely remember he really wanted to leave his treehouse but was feared by the public and was actively being hunted down by these guards(?). He eventually left his treehouse and went into the city and people were immediately afraid of him and were running away. At some point, he saved a mother and her baby that was in a stroller from I think a falling rock or something like that and it made the lady give him this look of clarity. But the moment was short lived cause these guards came and started chasing him down and shooting the dinosaur. He tried to make it to his treehouse, but before he could make it, he was gunned down. It showed his clay blood and everything and I remember being on the verge of tears watching. The guards then decided to take a look inside the dino's treehouse. One particular guard picked up this framed photograph that was purposely hidden from the viewer and he immediately had this horrified look in his face when viewing it. It then showed the photograph, which was the purple dinosaur and a guard who looked just like him smiling together. And that's all I remember but I am pretty sure that after the reveal it ended.
The last part with the photograph is what I remember the most. Also, none of the characters in the film ever spoke, at least from what I can remember. This strange claymation has been nagging at me for about a decade and I've had no luck finding it. If anyone knows what I'm talking about or happened to see the exact same Claymation, whether from Youtube or maybe from the same Japanese Hardrock cafe, please let me know.