Would you think other countries are just idiots that don’t know burning garbage to generate power is better than just burying them?

Yes, and garbage incineration to generate power or other forms of energy is a thing that happens in many countries

https://www.researchgate.net/figure/Waste-incineration-capacities-by-EU-MS-Medarac-et-al-2014_fig37_304917594

The green dots represent electricity-generation plants, and the red dots represent plants that are used to generate both electricity and (presumably district) heating. Figure is from a paper from 2014, which I found after a quick Google.