If two people were discussing something and they want you to share your thoughts, even more judge. A bit like a lawyer. If someone started with saying something that the other person thinks is unimportant and trivial perhaps because it may play against him. But you say 'no harm in listening to what he has to say, plus, he has forced me to hear him'
Is there a phrase, that is used to mean that 'has forced me to hear him'. In arabic we say ' ألزمني الحجة', which literally means 'compelled me to the argument'. But I don't think it's suitable. Any phrases or idioms that are kind of matching in English, maybe even a law terminology or a common saying?