Livestock Antibiotic Overuse

You're generalising US practice globally. In the EU, antibiotic use in livestock is strictly regulated. Antibiotics can't be used as a feed additive and can't be used prophylactically. The parliament is currently debating a complete ban on the agricultural use of several "last resort" antibiotics that are important in the treatment of drug-resistant infections. Even China are banning the use of antibiotics as a growth promoter.

Let's keep livestock in poor conditions and give them antibiotics to survive, then complain about the consequences

Removing antibiotics as a cheap default option (as it is in the US) creates an economic incentive to ensure livestock health and welfare. In practice antibiotics are used mostly to compensate for unhealthy conditions and to increase yield (i think only by about %10 for milk, for instance). Keeping livestock on broad spectrum antibiotics continuously for their entire lives is not only medically unnecessary, but deeply irresponsible and a contributor to rising antibiotic resistance.

Farmers massively administer antibiotics so they can keep animals in crowded/unsanitary conditions. If antibiotics were administered properly that would severely affect their revenue.

It's worse than that - the meat industry uses antibiotics on perfectly healthy animals as a growth enhancer. This is pure profit motive, nothing to do with veterinary care.

It's not only cheaper to feed animals antibiotics, but it also makes the animals put on more weight quicker, which is monetarily beneficial for the farmers/companies in the industry. From whatever I have read (over time), this is a routine practice in most places around the world.Unless serious action is taken around the world to reduce or eliminate this practice, the disturbing predictions on untreatable epidemics may come true within the next couple of decades (there are already t

Are there antibiotics not used on humans that can be used on farm animals?

"Big meat can't quit antibiotics"Nor should they. The impact would be more far reaching than what's being discussed in the article.

And people still wonder why civilized countries forbid prophilactic antibiotics usage in livestock....

For reference, ~80% of antibiotics in the US are used on livestock, not to treat infections, but to prevent them and because pumping them full of antibiotics successfully increases animals' weights[1], as you said.[1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4638249/