The argument they tender, ignores the devil in the details.
I just bring the devil out for dinner.
(and, just to note-- the majority of the land use involved in US cattle ranching, is the large tracts of prairie grasses used to grass feed. NOT the corn fields in iowa that supply the feedlots. In terms of total acres used, the overwhelming majority used for cattle production, is in fact the grassy fields. To satisfy the argument, all that grass would have to be exterminated. That is beyond absurd and destructive, and the argument is taken from a dangerous position of ignorance. )
Why would all the grass have to be exterminated?
The argument I’ve heard regarding land use for cattle is about the crops grown solely to feed the cattle, rather than repurposing the land the cattle is using.
To address your argument, you’ve shown that a great deal of cattle production doesn’t use those crops in the US, but (without research because I just got up and can’t be bothered anyway :p so I’m assuming the rest) the remainder use land for the cattle
and land to grow crops to feed the cattle. You can get rid of those cattle so you can repurpose the arable farmland used to feed them for human feed, or whatever you want to grow.
Another part of your argument I’m not sure about is that vegans argue the land used by cattle should be used to grow other crops. As mentioned a couple of paragraphs above, I think you might be mistaking the argument over cattle land use, but if not, why does the land have to solely be used to grow crops instead of repurposed for something else? You said that the land would get used for other industrial uses, why not an environmental use instead? Recycling centers or something of that ilk.