Integrity and honesty enable the actions outlined in that rule. This means they say what they see, not what they think will make them look good or make others feel good. They demand that others say what they see. They report their intentions early and their behavior matches. They report their defensiveness in order to move past it into problem solving.
Leaders go first.
They don't wait for the culture to change. They don't just talk about changing it. I admit that I have a lot to learn being that I'm still young and have a long way to go, but I honestly believe this. Forgive the cliche, but while it is important to look before you dive off a cliff, it is always the first ones who dive that make the biggest splash. Leaders don't look for water to jump into, they create the pool of water and are the first to take in a big swig of it.