I'm confused by this stance. How could burning it be better than burying it?
If you bury it it's (relatively) inert and all stored neatly in one place. Whereas if you burn it you release it in the atmosphere, release carbon and probably not-so-great residues everywhere.
If you bury it, you slowly leak all kinds of toxic stuff into groundwater and soil around. If you incinerate it, you recover some heat used for district heating and you have controlled circumstances - filter and monitor emissions.
And in some very flat countries, those landfillhils become nice recreational landscape features, for example, the "Col du VAM"¹ in Drenthe, the Netherlands.
If you bury it it's (relatively) inert and all stored neatly in one place. Whereas if you burn it you release it in the atmosphere, release carbon and probably not-so-great residues everywhere.