I'd do it if I have cause to fly into the States again, but I can't help but think its not really going to help much. From my youthful experiences at being a knob, I'd say don't piss off food makers/deliverers, or airline staff. I once annoyed a Qantas security lady, and I noticed it for a fair few trips afterwards. Then again, with wealthy interests controlling the US, I can't really see what will help at this stage. Its a descent into corruption and mess, but I can't judge how quickly it'll crumble.
You can opt out politely; I do it all the time. Recently, it's been interesting, since I dislocated my shoulder and can't yet lift my arm as high as they want me to. But it still seems to work out.
