Yeah, this is a good point. I have never tried removing my doorbells without the tool (I don't even currently have one, but I've had a few brands in the past), but I have no doubt that you could do it without much trouble if you don't care about damage. I will say, I saw no evidence of damage in the photos of the mount, but that doesn't mean that there's not damage to the (unrecovered, AFAIK) camera.
That said, to avoid perpetuating any tidbits of misinformation, I do not think there is any video of the perpetrator picking up a rock. Please provide a link if you have one, because I haven't seen that. There is video of them picking up the flowers from the ground, but that's all I'm aware of.