One way to measure empirically whether he incited the crowd to violence would be to measure the number of capitol buildings stormed, gallows erected, and police

One way to measure empirically whether he incited the crowd to violence would be to measure the number of capitol buildings stormed, gallows erected, and police officers killed by that crowd before it dispersed. Perhaps you could compare it to the number of police officers killed by the crowd who attended other mainstream politician’s speeches, such as speeches by Obama, Ted Cruz, or George Bush