Why is it always the best people that we lose first?

since i was young i was told
over and over again
that life wasn't fair,
everything happens for a reason,
and that when we look at death
we have to see that person and know we will
see them again in the future.
but i look at it now and
don't understand anymore.

if everything happens for a reason
then explain this to me, how could
someone bring bad and suffering upon
a person knowingly? why would you do
this if you know it will hurt others?

it's in times like this i tend to lose my sanity,
hope, and faith.