intolerance kills parasites, be sure to clear out every last one; parasites will adapt if you let them any chance; parasites are a plague in society, to a point they make the rules and dictate you live in conditions only favorable to them, to keep themselves alive; their world view is passed down and shared so you must also be sure to squash smaller parasites, the ones that have their back and want their spot; i mean even biological parasites didn’t choose to become parasites, but their elimination is not negotiable and they will fight against that.