Because we want to understand what impact it is?

Residential house emit heat too, but - most of the time - we don't consider them "destroys local ecosystems".. Maybe they do, but we don't treat them as a boolean thing, we try to understand the impact...

Unless I'm misunderstanding, TFA is talking about a closed loop system and uses a coolant mix, so yeah I think a citation is needed.

Actually yeah, data centers using evaporative cooling shouldn't be causing more waste heat problems than most types of heavy industry. Heck, I would guess that even if datacenters dumping hot water on rivers it shouldn't have much of an impact unless the river is very small.

Shouldn't spread misinformation when there are plenty of other valid points about datacenters.

https://en.wikipedia.org/wiki/Burden_of_proof_(philosophy)