Certainly the right timeline is important, but couldn't something like the noose incident, combined with many tiny things over the course of a year incite someone to violence, too? Sometimes, if issues are not addressed, people get madder and madder about them. It may not just go away if no one deals with the underlying issues.
Q: How many poets does it take to change a light bulb? A: 1001...one to change the bulb, 1000 to say it's already been done.