It is if I can trust you. The reality is i can’t. So if you have claims and its important for you to ensure i understand or accept your input then you better be able to back it up or I won’t.

If you were ‘there’ then prove that.

There are a lot of scenarios where it is just not important to have acceptance or agreement from the other party so it’s not like this is a universal rule. But if you have to rely on ‘trust me’ then you have to accept that some people simply wont.