I dealt with this guy at a previous role. There was always something off with the LOAs they provided. They came off as somebody that would just badger until they found somebody who’d do something to get them to go away.
Much better to build relationships which enable you to get things done by virtue of others wanting to look after you.
For those on the demanding side, it can be a badge of honour not to take "no" for an answer. While those on the other side, are being deliberately placed between a rock and a hard place. Just for another's benefit.
If not unethical, it is at least dishonourable.