The decapitation and burning of the pig symbolizes their hearts' desire to decapitate and burn human beings, whom they have already dehumanized to themselves by equating them with pigs, and whom they would like others to dehumanize also. If they could do this to actual people without being punished for it they most certainly would, because they are murderers and liars. Most protesters, peaceful or not, aren't really after peace, but rather, they're after power, because they believe that power will save them from suffering, death, and even worse: meaninglessness. But it's not so: power can't save any one of us, except the Power of God to raise us from the dead and give us Eternal Life in His Heavenly Kingdom. Outside of this there is not hope, nor is there any truth, but all is just vanity and lies, leading to murder, ultimately, just as it always has,.