and then I wonder...what did they die for?

This was the day,  I was 16 and for the first time, I truly realized how young, ignorant and naive' I was.  It was 47 years ago today,  students not much older than I, were shot at and killed for expressing their opinion. There are days they have been the motivation for me to speak up and other days they have become part of the reason I keep quiet...and then I wonder...what did they die for...