Because we're being wise enough to question if this might have unintended consequences. For example, it might just shift the problem elsewhere and cause more severe draughts for someone else. Just a hypothetical to point out why people might not be immediately onboard with this.

Tho, fun fact, California has been doing this kind of stuff since at least the 60's. It's called cloud seeding and we've had numerous programs running. They just never got much attention. But technically, the chem trails conspiracy is based in a bit of truth. It's just not every airplane, but it's happening. A quick Google search will give you tons of government pages about it. It's not a secret.