Agricultural water use is bad and wasteful, overuse of fertilizers cause toxic algae blooms in critical biomes which devastate ecological balance.
Data centers directly pollute groundwater with heavy metals, glycol, and other biocides poisoning local groundwater making it unusable for people and agriculture.
Agriculture and datacenters aren't the only water consumer/polluter. Mining, industry, and LNG fracking are major polluters as well. Regulations that used to protect the environment and water supply have been gutted by DOGE and the Trump admin so there is no institutional leverage to preserve our natural resources.
Also, data centers are still being built, which means the current water pollution levels will rapidly compound in the next few years. Several Data centers are being built right in my back yard. The amount and kinds of impact these things have on rural communities is devastating; living near farms just means being stuck behind a tractor on your daily commute for a couple weeks a year. Living near datacenters is and ecological and spiritual blight.
Stop splitting hairs. It isn't "data centers aren't as bad as agriculture," the data centers are bring built where there used to be agriculture, and will have a devastating effect on agricultural capacity. Basically there is a mass industrialization that further compromises water supplies in addition to adding all sorts of environmental pollution, on top of rapidly accelerating deterioration of natural environment and resources. It will have a compounding effect that will damage natural infrastructure for agriculture.
The whole framing of your argument is bizarre. You are literally poisoning the well.