Ask the people of Lakeview and Russell's Point how they feel about it.
This is a double edged sword. Tornado takes out a school. Mass casualties. Is a brick school safer than many houses? Probably so in most cases. If everyone is spread out in their homes throughout a school district. . . .a couple or few houses get hit. . .there is a lower number of people hurt versus if they are all in one location.
Statistically? Pretty low odds either way. BUT. . . If something like the Indian Lake tornado hits, do we risk everyone in a single location and hope it misses the school? Or do we want them dispersed throughout the community to where only a portion of them are hit? It's a gamble either way. I can assure you the school will take the full blame if they keep the school open and it is hit by a tornado.
It truly is a lose lose scenario where schools are forced to error on the side of caution. It is mitigation of liability. If they closed the school, the school reduces their liability risk. In all reality, (with no science or statistics to back my thinking), I would say the chances of being hurt or killed by a tornado are "likely" fairly low.