Trying to endure loss in isolation is more than painful; it puts our lives at risk. Rambam understood that when he described the consequences of not being connecting to Am Yisrael at times of trauma, including our fast days.
When you have come into the land
that the Eternal your God is giving to you as a heritage,
and you have possessed it and settled there,
you shall take from among all the first fruits of the ground
that you bring forth from your land-
During the summer months the Torah's calendar contains no holidays save the weekly blessing of Shabbat. However, post biblical historical realities bring us a most significant commemoration on Tishah B'Av, the Ninth of Av.