Further to your point, our history is littered with examples of, to steal the Jurassic Park bit, being "so preoccupied with whether or not they could, that they didn't stop to think if they should". Things like moving horrible invasive ecologically devastating species around to "solve a problem" or "it looks pretty" (Cane Toads, Rabbits, and Kudzu, for example) have had dire results.

Cloud seeding is definitely a well practiced thing by now, but it's unclear what the short and long term effects are if we do it at a significant (continent or hemispheric) scale.

I'd love for it to work out and for humanity to actually deflect the looming impacts of climate change.