Isn't burying in a landfill better than burning considering the carbon sequestration considerations of burning what will likely be plastic products? At least with burying we are a little bit closer to putting the oil energy back under the surface of the earth vs having it around in the atmosphere.

If you capture the heat from the burning, e.g. to generate electricity, then that can save burning oil/gas/coal instead.

Furthermore, the landfill will usually also generate gasses like methane, which need to be burned off too.