> In this case, rather than claiming you disagree (which should imply understanding), you can just say you don't know enough about the issue to comment on it.

> In this case, rather than claiming you disagree (which should imply understanding), you can just say you don't know enough about the issue to comment on it. aidenn0 is making a subtlety different point: this form of rational argument depends on good-faith. If you think that has been violated, you would not say "I don't know enough about the issue to comment on it," but rather "I don't think this person is arguing in good-faith." I agree with the principle of charity, and your claim that you should understand before disagreeing. But it is also true that you will encounter people who are not arguing in good-faith, in which case it is sometimes a mistake to even engage.