Sometimes, things that are fine become problems when done at scale.

Fishing, for example, is not terrible when it's you and your dad with a rod and bait. But we have the technology to create ships that dredge the ocean and exterminate all life. The scale is the problem.

To borrow a phrase, quantity has a quality all its own.

That's true but the GP comment was making a qualitative argument rather than a quantitative one.