I think some of it related to cognitive dissonance or even a vengeful "you caused me grief and I proved you wrong." Unfortunately, a lot of it is based on a misunderstanding (of our often mis-stated) argument, combined with a more relativistic viewpoint of having just graduated and got that job with a bigger paycheck that ever seen before.
The argument (at least mine) is not that every student of these programs will be non-licensable and/or hindered by staggering amounts of debt, but rather a relatively large percentage of students will be, and that these programs are based on a predatory business model of taking in students with big dreams and little other perceived options. When 1/4 or more of matriculating students don't finish or can't pass EPPP or get licensure and it cost them 5-6 figures (non refundable and very often financed!) to do so, that's the problem. The view from a year or two out may seem pretty good, but decades of 1000K/month loan payments, sold to you and predicated on the miraculous PSLF!) can change that view over time.
On the clinical side of things, I have had overwhelmingly poor direct experiences with practicum and internship students from one of the first and biggest of the predatory stand-alone PsyD warehouses. Advanced standing students with a paucity of clinical experiences and abilities, let alone knowledge, with minimal professional skills and and a "I have the right to show up late, not do the work correctly- or at all- and be a jerk to you about" attitudes. Again, this is not all students, but more the rule than the exception. On the contrary, well prepared and eager to learn (and eager and able to teach me things) students are the rule from University-based, small cohort, mentor model programs I have worked directly with.