No, really, it isn't. Part of the picture? Sure. But here is literally the history of nuclear regulation [0]
You'll find a tremendous amount of regulation occured long before that time. And yes, in the wake of Chernobyl and our near miss at 3 Mile Island, things were tightened up more, but the lack of new plants was as much about negative public perception than anything else, including very strong coal and gas lobbies that had a vested interest in keeping nuclear energy's market share as low as possible. In the face of multi billion dollar entrenched interests, you over estimate the impact of small non profits. If you really think the industry is over regulated, blame those entrenched interests, not some vocal minority and NIMBY folks.
You also failed to address the point about the excellent safety record of a well-regulated nuclear industry compared to the awful record of significantly less regulated power sources.
Even if you are right about the high cost of regulations, what has that achieved? It has achieved a product that actually prices in the true cost, unlike all of these slipshod practices with oil or coal, where the cost of their incredibly awful safety records is passed indirectly on to everyone. So even if you're right, you've simply described the correct way things should work: potentially unsafe products should have a lot of upfront costs to ensure safety. If we all had to pay for the full environmental impacts of such choices up front, we'd be hammering down the doors of nuclear power to get plants built because, done right, it is safer and cheaper than pricing those same consequences into coal and oil.
[0]https://www.nrc.gov/docs/ML1029/ML102980443.pdf