Agreed.
The old saying... 'you'll get more flies with honey than vinegar'.
Also agreed ... once you start the fight... the fight is on... and walls will go up... people take sides... people stop listening ... those not wanting to get involved will avoid you etc... you can always pick a fight latter after you start off polite and meek if that is what you choose to do ... but you can't always go back to polite and meek after the fight is started.