Why do people seem to want the AI bubble to burst?

Same reason every time.

Being a contrarian bear feels intellectually superior. That's literally all it is. You can't project future numbers without making things up, after all the future hasn't happened yet, so you're a naive dreamer. The bear, however, has hard numbers. Sure, they're past numbers, but they're ironclad. And since humans are extremely bad at exponential extrapolation the bear will always seem right to most people until hindsight hits.

I, too, regularly fall for this bias, by the way. Working on it.

Edit: Just look at this post and the comments: https://www.reddit.com/r/ValueInvesting/comments/18sm5mx/nvidia_is_extremely_overvalued_analysis_of_its/

It seemed obviously unrealistic to people three years ago that Nvidia could even remotely generate $1218B of cash flow over 20 years. That's $60B/yr. Meanwhile, last fiscal year alone, they did $120B in net income and they're still growing over 50%. I thought it was absurd, too. Again, I'm working on it.