Im probably going to have an unpopular view, but discussing hard topics helps kids learn thinking skills. I teach a 9th grade homeschool class once a week, and my students argued over the death penalty last month in a team policy debate. They had to research both sides thoroughly and be prepared to argue for or against with the toss of a coin. This would have been a very appropriate discussion to have after the debate as long as my students did not have connections to the people involved.
I did not see the worksheet, but I do agree it was too close to home for these particular students. Terrible judgement by the teacher.