I suggest you look up "factory farming" before making claims like "It’s not like a dairy cow has a life of eternal suffering after all". They literally don't do any of the activities you mention.
Mega Farms are mostly an American issue. I do not support them at all.
This is far from a US-only problem.
[1] https://www.liberation.fr/france/2018/06/04/porcs-bovins-vol...
Yes, some farms may operate in line with an acceptable standard of ethics, but for many people, it is easier to live a vegan lifestyle than to carefully ensure that all their dairy is ethically sourced.