The observation that humans poop is not sufficient justification for spending millions of dollars building an automated firehose that pumps a torrent of shit onto the public square.
I make no claim to the overall value of LLMs. I'm just pointing out that your analogy is a fallacy. The fact that group A does a small bad thing is not a justification for allowing group B to do a large bad thing. That is true regardless of whether group B does there non-bad things.
It may be the case that the non-bad things B does outweigh the bad things. That would be an argument in favor of B. The another group doing bad things has no bearing on the justification for B itself.
From my experience the people spending "millions" are hoping they get those millions * 10 back because a buddy of theirs told them "this AI thing" is going to replace the most expensive part of companies, the staff costs, not because they think the product is any good. We're getting AI forced down our throat because VC is throwing cash in like there's no tomorrow, not because of whatever value might or might not be there.
