The "humane" argument is flawed because in the end - factory or pasture - the animal is killed. Live a happy life and be slaughtered or a miserable life and be slaughtered.
What is the argument you're referring to, and how is it flawed due to the fact that factory-raised and pasture-raised animals are both killed, regardless of the nature of their killing and the nature of their lives?
Can you stomach eating fruits and vegetables from an industrialized farm knowing that more animals died to make your salad compared to my steak? Or are certain animals lives worth more than others?
"crop deaths tho" is not a stable argument. Eating meat requires death. But there are ways to avoid killing animals when harvesting grains etc. And in any case, it's a very inflated view - you're still killing more animals by eating meat than you are by not.
I've seen this thoroughly debunked several times. What "numbers" are you alluding to? The most commonly cited number I've seen from a 2003 study is 7.3 billion crop deaths per year, which experts seem to agree is likely a large overestimate. Even if that were the case, that puts crop deaths at an order of magnitude smaller than the number of _land_ animals slaughtered every year; that number is further dwarfed if we included aquatic animals.
Additionally, the crops where some of the highest number of field deaths are encountered (such as soy and corn) are also primarily as animal feed.
Furthermore, most meat eaters additionally eat plants too, and the animals they eat also usually are eating industrially farmed plants, which really makes the crop deaths argument silly.
Wave your hand, call it debunked and then pretend that we grow far more surplus crops to feed animals than we would need to of everyone switched to your disease riddled cult diet.