Stupidity: As the position of the Tiger was perpendicular to the Sherman platoon's line of march, and they were advancing across totally open country with firm ground all around, it didn't matter a hill of beans whether they shot the first or the last tank in the column.
Stupidity: In the exciting denouement when the SS company approach the ostensibly disabled Sherman, the SS would have just walked around it. A burning tank was a common occurrence. I doubt they would start climbing on it and they certainly wouldn't start charging at it individually as to get mowed down. The SS were well trained units. Such stupidity is unlikely.