Preaching vegans on youtube annoy me and may think you can avoid them. You're wrong. Camera reviews and tutorials include them adding their politics.
I found a review of a canon I was thinking of buying, the kid called Vegan Socialist ending his review with an audio test. At this point, he got preachy and decided to say 'stop killing 150 billion animals a year, yourself and the planet'.
My thoughts are so fucking what, sure you can cut production of farming, you can make it more humane, but over farming to feed everyone with the ideal vegan diet won't save the planet either. All you'll do is drive pigs to extinction while feeling better about yourself.
The most obvious and humane food production with easy protein is to breed bugs by the 100 trillion and process them into artificial nuggets and burgers, etc. It's probably a lot easier than farming a perfect vegan diet for billions of people.
And, to troll people like this could dream up good arguments for humane cannibalism that are as morally consistent as the vegan arguments.
In any case, a radical rethink on morality would be required.
Another thought that works far better than the above ramblings is to lower meat production by the supermarket that floods their stores with cheap meat but means a vast sum of it will be wasted every day and as a result, keep the demand for meat high. Same for fast food places and many others establishments that waste huge amounts of food per year.
Lower the need or desire for meat and you may have run out of Tesco pork chops, but you'll kill fewer animals every year.