If you make other people's planning problems your own problem, then over time everyone who planned poorly comes to you to save your day, and you burn out.

And then you're somewhere crying on the floor or in a hospital, and not coding. The organization around you has adopted to poor planning, because you encouraged them to do it.

I've started telling myself something and it's helped me to curb a bad habit:

"I'm not wasting this food by throwing it away, I wasted it when I let it go bad in the refrigerator"

If we really do care about the customer, we should be fixing the problem at the source, not trying to scramble to fix things after it's too late.