Sure, meat is good for us. And sure, non-factory animal farming may be good to a certain extent.
But as much as I like meat, it's a fact that factory farming has got out of hand, and that eating factory-farm-produced meat is probably not the healthiest choice.
Remember mad-cow disease? The "farmers" found some nice cheap food, with which they could improve their bottom line if they fed it to their cows. It just happened to be processed remains of dead animals.
And that's just one effect. More will result if we don't deal with the causes.