If you reject the reality of climate change, your grandchildren (and maybe even your children) will not think kindly of you.
If you think pulling out of the accord and following policies to promote coal, oil and other fossil fuels will strengthen the country, you are wrong. Fossil fuels are finite: they will run out. Anybody who hopes to return to the days when gasoline was cheap and coal was king is trying to take the country down a dead-end path. Again, your grandchildren (and, again, maybe even your children) will not think kindly of you.
Either we approach our problems clear-eyed about the limitations the world places on us, or we deny our descendants their future. It's as simple and as stark as that.