the recent death of a woman

Recently a girl returning home from a disco got killed by 4 inebriated guys who were also present in that disc. The sad part is that amongst the 4 were 1 School kid & 2 college kids.
What made these 4 guys chase after this girl & then crash their car into her 2 wheeler ????
I guess no body can give a definite answer. I'm sure psychologists will have a convoluted answer which is just a lot of bull.

The best part is, the local news Channel (SUN TV) is having a field day by repeating this news. These bastards have shown the same footage repeatedly, the half naked dead body of the girl & the 4 guys coming out of the police station.

A suggestion wud be thatall the discs with attached bars must prohibit teenagers from having alcohol. but then this is not a lasting solution.
Hopefully such mistakes shud never happen again !!! But then this wud only be in utopia.