There are a bunch of studies out there [0][1] (two I found immediately) showing the risks around problem gambling, but like with most vices people who’ve already picked the pro side tend to react in the same predictable ways (myself included):
1) Dismissal: Feigning or having a profound misunderstanding of how statistics work by poking at the methodology like “N=200? That’s meaningless.”
2) Apathy: “So what if some people get addicted? We can’t babysit everyone.”
3) Rationalization: “Yeah but it helps Native American reservations, so...”
4) Downplaying: "Ok problem gambling is bad, but how prevalent is problem gambling really?"
0: https://psycnet.apa.org/record/1989-05439-001
1: https://pubmed.ncbi.nlm.nih.gov/32402593/