If writing is a reflection of our thoughts and attitude, then changing the writing style would probably change our mindset as well.
Take a look at the two sentences below:
a. A teacher should be polite with students.
b. When a teacher is polite with students, students respect the teacher and they love being in the class.
The first one clearly is a preaching. “You should do this… You should do that.” Annoying to read. Also, the writer looks like a whiner.
The second one is a suggestion with a potential positive outcome. It’s an attempt to help, genuinely.
Preaching is easy. Helping is not.
May be, when we start writing in the second style, we’ll be able to contribute rather than just preach.