Passion as a leader tool

Passion is talked about in the workplace and good leaders use it as a tool for engaging others.
Unfortunately, expressing emotions in many organizations is taboo, even though good leaders do it within their own groups and keep it hidden from the larger organization - as if it were a weakness.

Is this a self trust issue or fear of ridicule/criticism, or what?

It's about time we all understand the value and benefit associated with expressing real and transparent feelings in the work world. They are what make us a whole person who has feelings and desires, wants and needs. They are what engages others at a deeper level than logic alone. They are what triggers excitement and enthusiasm for change and the achievement of stretch targets. They are many time the spark that engages others to learn more and commit to leading in their own way.

There are appropriate and inappropriate applications of passion/emotions in the workplace. The key is to only share your emotions/passion when you are truly passionate about a subject and the success or failure of it.

Versus using emotions to manipulate others in an external manner, true leaders will only express their emotions when they personally feel them from inside. They then transparently share these emotions and feelings with others in a respectful manner. This is what engages others to connect and learn more so that they can make a rational decision whether to follow or not.

Thoughts?