Hey, MOS? There's this thing you might have heard of called the Golden Rule. Y'know, the whole "do unto others as you would have them do unto you" thing? Try and muster up the slightest bit of empathy and put yourself in these folks' shoes. Suppose you've been through the worst disaster of your life: your home has been destroyed, your possessions are all gone, maybe even your place of business has been wiped off the map. You have no idea what you're going to do or where you're going to go, how to even begin to pick up the pieces. But luckily, relief is on the way, as volunteers arrive to help with the arduous task of cleaning up the mess, and your day begins to brighten.
But then one of the volunteers comes up and begins hectoring you about how it's your own damn fault for causing the earth to warm and storms to get worse and you should be ashamed of yourself.
Is that really all that helpful? You're kicking people down while they're at their lowest point, berating them for the horrible crimes of driving a car and using air conditioning. Sure, you're still helping them out with the actual labor, but are you actually helping with that mindset? And do you think you're actually going to make them change their minds about the whole global warming thing when they have much more pertinent things on their mind at that moment, things like "where am I going to sleep tonight?" or "what am I going to eat?" or "where do I go from here?"