"Elsewhere, decapitated bodies make between 2.5% to 6% of burials." That seems like a really high percentage of the dead were executed. Is it reasonably to gu

"Elsewhere, decapitated bodies make between 2.5% to 6% of burials." That seems like a really high percentage of the dead were executed. Is it reasonably to guess from this fact that 2-6% of Roman mortality was caused by execution? That seems absurdly high. Maybe burial in a cemetery was more common for the executed than the otherwise deceased?