Sadly, you are very wrong. One of the biggest problems ot the scientific fields of today is precisely that debunking existing theories achieves literally nothing for the people doing the debunking.
Scientist careers today live and die by citations - how often their published work is cited by others. The problem is that published works that debunk an existing theory get cited several orders of magnitute LESS than the work they are trying to debunk. Worse yet, among people who actually read the "works of disproval", the majority only slightly change their opinion of the work being criticized.
So no, in the current environment it is highly improfitable and illogical for a scientist to engage in anything but original work (or work that at least looks original).