Manners are important. I believe that 'please' and 'thank you' go a long way toward positive interactions with others. I think that it is especially important to remember this when speaking with Civil Servants. Government agencies, like the DMV, have a bad reputation for a reason. It's co-created animosity. Civilians walk in expecting a long line and crappy service. Meanwhile, the employees stand at their little window expecting customers who will have bad attitudes and treat them with disrespect. Let the cycle of frustration begin!
I find that treating someone with respect and patience makes for an easier interaction, as well as creating a sense of ease and cooperation in the other person. Perhaps if you're polite and compassionate to a grumpy, frustrated Civil Servant they will in turn want your experience to be better. Perhaps they will be more accommodating, more helpful, and kinder, too. Win-Win!
Anyhoo...here is a wee thankful cat.