In a way, Saunders has a point. 
The damage from 9/11 was immediate, tragic to the n'th degree and super-shocking. No question, but it was temporary. (The Iraqi and Afghan invasions that followed are another story. They were as reactive then as Trump is now, but not a necessary consequence of 9/11. Bush Jr. was itching for a reason to invade Iraq and complete his father's blunder. The Afghanistan venture, we have learned, was too simple-minded for the  complex situation that it presented, an attribute which I often find characterizes right-ish reactivity. Leftist ones too. Again, that's another story. )
What Trump is contemplating as energy and environment policy (or lack thereof), to name two, are likely to have much more prolonged consequences and not just for the US. That is tragedy too. Affecting billions instead of thousands and costing orders of magnitude more money in damages.
And no, no libtard am I.