I think the hiring and reward practices of the organizations & the industry as a whole also encourages this sort of behavior.
When you reward people who are switching too often or only when moving internally/externally, switching becomes the primary goal and not the product. If you know beforehand that you are not going to stay long to see it through, you tend to take more shortcuts and risks that becomes the responsibility of maintainers later.
We have a couple of job hoppers in our org where the number of jobs they held is almost equal to their years of experience and their role is similar to those with twice the experience! One can easily guess what their best skill is.