I think you're agreeing. Loyalty to people is awesome. Loyalty to corporations is not.

Both is true in my opinion. Strange thing I witnessed, loyalty between corporations matter (e.g. suppliers and customers) and loyalty between people matters (just pick wisely, not everybody is worth it). Loyalty between corporations and people doesn't exist and is usually a one way street.

I think it's both. You won't get very far if you treat everyone at your job like an enemy. Don't burn bridges if not necessary. If you find a better job, leave graciously and do what you can to help transition. You don't know when you will need the help of somebody there in the future.

Also understand the motivations of people more powerful than you. They want to succeed, get promoted and make more money. If your goals align with theirs, you're golden. If they see you as being an impedance to their goals, you will get tossed aside, no matter how much bullcrap they heap on you in orientation and all-hands meetings about caring about the employees. It's just profit and loss, raises and promotions- nothing else.