Not So Bad?

Year in and year out Jews around the world observe the "Three Weeks" period of mourning, culminating in the fast of Tisha B'Av. It is a dangerous time for Jews, though most don't know why. They know it has to do something with the temples that were destroyed, but beyond that... This is why the mourning comes to a screeching halt once Tisha B'Av is over, as if everything is just fine the rest of the year. It's not, and we need to know how and why, if we're going to protect ourselves from another national disaster.