Was I a sucker for believing that Kalshi was going to [e.g.] help farmers hedge against drought years or is the problem just morally bankrupt selection of events?
If they said that and you believed it kinda. There are already markets and insurance schemes to allow farmers to do that though through crop insurance, it's a very old and even government subsidized to keep the prices down in many countries. Farmers in need of that can already insure their crops to make $XXX amount of money to make sure they break even on the crop for the year for example there's no real need to bet on the amount of rain to reach that same goal.
Yep Kalshi is at best only shrinking the scale of things a farmer could bet on instead of getting proper old style crop insurance (either yield or revenue). It's just cloaking a weather slot machine in "we're helping farmers" language. Agri-washing their betting market if you will.