I agree with your reversed statement. The company needs to be loyal to it's employees too.
But in my opinion, some principles should not depend on how the other side acts:
"If my company is not loyal to me, it's my right to deceive them as well."
-> No, I will stick to my principles. I might bring it up to management. I might quit. But I won't act destructively because the other side does.
Otherwise it's a downwards spiral:
you will meet many toxic people in your life. If you lower your standards everytime you do, at some point you will be one of them.
But in my opinion, some principles should not depend on how the other side acts:
"If my company is not loyal to me, it's my right to deceive them as well."
-> No, I will stick to my principles. I might bring it up to management. I might quit. But I won't act destructively because the other side does.
Otherwise it's a downwards spiral: you will meet many toxic people in your life. If you lower your standards everytime you do, at some point you will be one of them.