As other posters have noted I think you are confusing ethics with personal opinion. You might not like your boss and disagree with him politically but that doesn't necessarily mean that is an ethical conflict even if you think him winning wouldn't be a good thing for his constituents. An ethical conflict would be if you know he is doing something illegal and / or asking you to participate in it and not say anything about it to anyone else. Other than that just hating your boss but not saying anything because you want to keep your job is something that a lot of people experience.
Adultery isn't a crime. Being lied to isn't a crime. I don't feel I have a moral responsibility to go to a person I have no relationship with and tell them they are being lied to. If I knew the person doing the lying, I might feel compelled to tell them to stop lying. If the deception is bringing actual harm to the person, that would be another exception.
No one said "it's a crime because law 23403406 [or whatever]." So... you like being lied to, you like people lying to others? It has to be "harming"? How far do you let it go? Physical only? Well, if your answers to my questions are YES, that's pretty sorry, if you ask me. FAITH IN HUMANITY... losing...
Being faithful to your partner is of course something I find to be very unhealthy for their relationship, but it is not an absolute moral issue. OK, lets say I know of a couple where the husband is cheating on the wife. What if the cheating husband continues to support and love his wife? And what if, for whatever reason, the wife would rather remain blissfully ignorant than know about her/his partner's indiscretions and feel the emotional pain as a result? These may be exceptional circumstances, but still who am I to decide its best for that person to know what's happening behind her back? Its a bad situation, no doubt, but not something I feel I should insert myself into. There are, of course, some exceptions, but I'm talking about the general case where its essentially a stranger or someone I just don't know very well. If I was a personal friend of the person being cheated on and knew their state of mind and something about the status of their relationship, then maybe I'd tell them what's up. Or if I was a friend of the person doing the cheating, I'd probably advise him to stop it, though I don't think I would insist that he admit what he did to his partner.
durv, i don't think it works like that, at least not in my case. i am the most compulsive romantic you could meet. one affair would lead to another up to the point where i'd destroy my marriage and family. i can't tell you how many flirty naughty situations i go through. i'm bad. i had a pretty girl walk into my bar today. she was cute and demure and i told her that her deep red sweater was evil and that evil is awesome. she blushed. i caught my snap and stopped the attack. she'll be back. was that unethical?
also what about this: your friend kills someone for a dumb reason (money or because of an argument), then he goes to your house and ask if you can hide him and the murder weapon for a while, so the cops doesnt find him, would you do it? its loyalty because he is your friend, but is unethical and a crime to hide a criminal and to hide evidence too.