On the one hand, it is very easy, I do it all the time. For myself, I consider all the counterarguments available. The result is the base of my own position. On the other hand, it is close to impossible for me. Once I have seen the weakness of the arguments against the position I have chosen, to defend it openly would force me to defend arguments which I know are cheap, weak. So, doing this would be some sort of unethical - I would have to propose arguments and to hide counterarguments I know about.