Aristotle says persuasion is a mix of ethos, logos and pathos.

People are more likely to be persuaded when it is clear you believe in your message and are passionate about it.

Perhaps you could think about pathos as being conviction and drive.

It’s OK to write passionately even in scientific or government writing, as long as you are not being emotionally manipulative.

Don’t fall for the lie that says passion and objectivity are mutually exclusive. Of course you can be both passionate and objective at the same time.

In fact, if you have sound objective evidence for something that’s positive for the community, it is likely it is good and proper for you to be passionate about it!