The sheer amount of excrement that you have to handle is absurd, and it's a well documented problem that the nitrogen leaks into aquifers and nearby water, causing massive problems (including the dead zone in the gulf of mexico). This is without commenting on how removing trees in the pasture reduces absorbtion of the nutrients on location and helps with the leaking into water.
What is done to animals in farms is also far from what most people would consider acceptable.
You might be out of touch with what this industry actually comprises.
Esit: And it's impossible to enforce anything on farmers regarding this, there are barely inspections every couple years of the state of the building, enforcing waste management and animal welfare is a pipe dream.