This makes sense, to a degree. But at the extreme, the speaker should absolutely take care to avoid being overbearing, condescending, patronizing, etc. Many delusional people think, "I am saying/doing this for YOUR own good", so simply believing that you have the other person's interest is not enough.

Or rather, in order to TRULY have someone else's interest in mind, you have to incorporate things like condescension as in-scope requirements for your communication. Otherwise, even good advice delivered in a straightforward but condescending manner, won't get through (which means, the person won't benefit, which means you the speaker failed to achieve the thing that would help advance their interest due to your poor communication).