Workplace Double Standards

How many of you have managers who want you to give it all you've got but aren't willing to do the same? I've seen it happen many, many times. A manager should lead by example. They should do the right thing at all times.
A current manager in the office I work in puts in approximately 24 hours a week at the office and claims to work from home the other 16 hours. The differences are staggering in what these so called managers do and what they expect from their teams.
I understand rules are rules but they should apply to all in the office. Just because one sits in authority as a manager shouldn't exempt them from adhering to office protocol. In the current situation, a woman was recently fired or as they like to put it, asked to resign, for repeatedly coming in late...she was late a lot....anywhere from one to four minutes....multiple times over a month's time period. She was an excellent employee except for her tardiness. She offered to stay late and make up the extra minute or two she lost in the morning but the manager would have none of it. Last Friday was her last day. Now, what irritates me about this situation is that said manager doesn't come in until nine (the office opens at eight). She leaves at three, on the dot. She usually takes Wednesday or Friday off. If she is going to be late, she sends an interoffice email from her iPhone informing everyone. Her office staff can't do that. They are not allowed. If they are late they get reprimanded, no questions asked.
At this point her office staff is short by two people. One would think that the manager would fill in and help pull the load. Well she does, sort of. She helps until three and leaves the other three girls to fend for themselves. I've heard her say as she's leaving, "if you need anything just email me." What a crock. This so called manager should be fired. She gets respect from her team only because she's an office bully (see my earlier post). She is a poor example of what a manager should be.
I give this example to say this, if you find yourself in a mangerial position, please earn the respect of your team. I have found that you get a lot more work done by helping where help is needed. Be a team player. You can still be in charge and still have authority but you can also be human. Your team will respect you and will go all out if they know you are there with them.