>They burned the entirety of the country to the ground.
Categorically false. There were huge swaths of Vietnam that were off limits to bombing.
>Laos is the most bombed country in world history due to the US trying to stop Vietnam.
Yes, with a fraction of the warplanes, airmen, etc. due to advances in technology like strategic bombers and cluster weapons. The overall air efforts are incomparable to what transpired in WWII.
>What would be considered "all out" if not dropping the most bombs in human history, and double the amount of WW2?
If only there was a term to encapsulate such a concept...
https://en.m.wikipedia.org/wiki/Total_war
>There is no higher level.
There absolutely is a higher level. Google what happened to Hiroshima and Nagasaki near the end of WWII.