Well, for starters, more than half of that "life" doesn't even have thumbs, so even if that life were sentient beyond eat/fuck/kill, it couldn't pick up rocks or anything. I would say the majority of "life" on this planet is dumpster life, evolutionary mishaps that haven't yet been culled. There are more interesting animals out there, elephants, dolphins, etc., but again, thumbs.

I agree, but most people couldn't care less about that. Most people eat meat, use housing that's displaced huge amounts of land that animals use to inhabit, etc.

Is it still on that floating rock when there's nobody to see it?

"If a tree falls in a forest"

Yes. I mean I am totally a species narcissist I admit.

We gain a ton of benefits from other animals, obviously. But if we don't exist, then those animals no longer matter. We wouldn't benefit from them anymore. Anyway, this is getting a bit in the weeds.