The problem with fracking is the same as with any for-profit industrial pro cess, where possible shortcuts are taken and risks undertaken to save a few bucks. For example, there is little risk if the well casings are properly done, and if the wastewater is safely removed from the site.
What tends to happen is they get sloppy with the wastewater, and the casing s hold up long enough for production, but things go to shit after the well is out of service, often abandoned.
It's worth noting the industries claim of 'zero problems/issues/accidents/c ontamination caused by fracking' only refers to problems that occurred duri ng the actual fracking pumping process, not to problems that occurred after the pumping process, but would not have occurred had fracking not been use d.