>>333889769American atheist here. There are better reasons to default on the null hypothesis that there is no god: no valid evidence. All of the books that are claimed by thesis to be divinely inspired can't even get basic facts like historical events or science right and even contradicts itself at times. I would expect better for an all-knowing, all-powerful god.
As for the explanation why the nature gore videos are proof of there being no god. If god does exist and he is all-knowing, all-powerful, and all-good, then how come he created a world where beings must kill other beings in order to survive?
Early Christians Marcion confronted this problem of the existence of suffering by claiming there were two gods: a god of the material world where everything is a mess and a god of the spirit world who sent his son Jesus to die for a ransom to the god of this world (Demiurge or maybe even Satan) that was responsible for our material existence.
Technically, we could still have a shitty world and a god who made it. He would be just a shitty god.