The problem is not your engineering logic, it's your word choice. A dictionary can be helpful in these situations.
Webster defines "trite" as "hackneyed or boring from much use : not fresh or original".
I believe the word you are looking for is "trivial", defined as:
1 : COMMONPLACE, ORDINARY
or
2 a : of little worth or importance
Indeed, a few hundred tons would be trivial, but I have heard some engineers refer to many thousands of truckloads of material that would need to be moved before attempting to rebuild the completely destroyed road. And, it may be years before the slide area is inactive. Basically, they're talking bridges to the far side of the river.
Mark