It's not about opposing data centers, it's about opposing them close to where you live.
There's now a gargantuan amount of documentation about their impact: - insane noise levels 24/7, you can hear them even at miles away - virtually no jobs brought to the place, besides some construction work early on - massive drain of local resources - massive eye sore
Like, I'm not against data centers per se, but you tell me they building one few miles from my house, I'm listing it the day I hear it and escaping as far as I can.