As French and Bolshevik revolutions demonstrated, scouring will scour, burning will burn, slashing will slash.
What is needed is building, humility and patience. Things like stadiums add to the infrastructure of civilization. Purging, killing, bombing will satisfy Puritan arrogant passions while bringing misery and destruction.
Go back to the history books. Look for transculturations - the many failed attempts [start with the Katyn Forest massacre - it is the easiest one to analyse, everything is on the surface] and the two large scale successes [even then the degree of success is somewhat dubious] - early expansion of Islam and the creation of Spanish colonial empire in South America. Both were genocidal. This would give you an idea of the depth of scouring required.