Requiring and taking time for purposes other than creating value for the company is nothing more than punishment. I understand being angry that you're sitting in the office twiddling thumbs while others are at home cooking. The solution here is not to punish those people for your own, and everyone's, in-office woes. The solution is to demand better for yourself.
I work in an office 5 days a week. I'll say right now - close to half of my time is wasted. However, I am still here in the office. Yes that absolutely sucks to know I could work 20 hours a week and achieve the same outcome. However, I am not "better" because I have enjoyed the punishment of spending that time. I am not more loyal nor more proficient. I am not less lazy. Pain IS NOT gain - that's a lie told by people with the intention of manipulating you to argue in favor of your own exploitation.
That's your management's problem, not yours. Your labor contract says that you owe the company your time, how they use it is not your business.