We're not defending employers' rights. We're explaining employment law, why it exists, and what the real world consequences are. And why, under current employment law, the employer can require you to be vaxxed, just like they can require you to pee in a cup and be drug tested, whether or not your being on drugs has any implications to your job whatsoever, and you have no right to decline such invasion of your privacy.
Yes you can. I knew a guy who worked for the same company for 9 years. The owner's son finished high school and needed a job, so they fired this long-time employee and gave his job to the owner's son. There was nothing wrong with his job performance. You have to pay them out for the proper notice period, but you have no right to your job if your boss wants to hire someone else, else you can prove you were fired because of race, religion or ethnic background.
I have a friend right now who has worked for the same company for at least 8 years - and he was recently put on notice because of his "bad attitude". He's had the same "bad attitude" the whole time he's worked there. The times he's been "spoken to" about this were completely fabricated, and the whole exercise is to make a basis to get rid of the "old guy" (63) who makes more than anyone else, and has 5 weeks paid vacation, and who is starting to have health problems, and replace him with someone younger, cheaper, and healthier.