Now before you jump onboard and say 'Of course its ethical' consider the current case that has dominated Australian media and Australian sport in particular.
Israel Folau is one of Australia's (if not the world's) greatest Rugby Union players. He is a match winner. He is talented beyond belief and has won an array of national and international sporting awards. He is currently in the Australian Rugby Union team called 'The Wallabies'.
Despite Israel's strong physical appearance, he is a highly personable, gentle and kind individual. He is extremely likeable. Israel is a Christian of the evangelistic ilk.
Rugby Union has as a very strong code of conduct. You will rarely see referee abuse from players - it prides itself on respect for all players, the referees and supporters. International players have particular responsibilities as so many people, particularly juniors, see them as role models. This added responsibility to acknowledge that whats said publicly must accord with the code of conduct, whether its said on the field or off it, is reinforced in player contracts.
Israel, despite being a very nice person has repeatedly made the following types of statements:
That those that are gay, unmarried people having sexual relationships, those that drink to excess....[the list goes on] are sinful and all going to hell.
Now Israel, of course, is making biblical references inline with his christian beliefs. He's not saying terrible things per se....HOWEVER - it has clearly been a breach of his contract and despite just recently signing a four year contract and despite being Australia's shining star - he has been sacked.
Israel Folau to be sacked by Rugby Australia over homophobic comments
Australian rugby's position is that it goes to great lengths to be inclusive. It is not concerned with who you choose to love, or that your mother is a single mother, or your father is in some sort of defacto relationship. It does not want those representing the sporting code to alter that perception with statements indicating that those following the sport are lesser individuals and are in some way bad for their sexual choices or marital status.
So the debate - religious freedom of speech versus the right of a sporting to code to insist its code of conduct is followed.
This has cost Israel Millions of dollars. He has lost sponsorship worth millions and his International rugby career is ended unless he can change his public statements.