Honestly, history is filled with so much dreadful events that it's really hard to decide which one to prevent. The tragedy is seen everywhere in history. We've had millions of people died because of political, ethnic and even religious wars, famines have wiped out whole populations, Tsunamis, floods and earthquakes just to name a few. But these are all those events that have directly affected people's lives. Calamities have also been seen in other very important aspects of life. Rulers have burnt libraires, a treasure of human intellect and religious and ethnic fanatics have hanged open minded and free thinking scholars.

Looking at all these horrible events in the history it's very hard to decide which one is the most dreadful. I mean how can we compare a tragedy with a tragedy. So, I am sorry but I can't pick just one such tragedy and say this should be changed. But, what we all can do is prevent such things from happening in the future.

Thanks for reading!