Believing that things happen for a reason is not a way to point blame. Its to accept that the mistakes we make will lead us to some understanding that is yet to come. It also is that special perspective to those that believe if you look at life positively, it will be good. Remembering all the bad things in turn will make you miserable. This way of perception is not directly related to the 'master plan' or fate.
I wanted massive change in my life, and one day I lost everything I have ever had to a flood. My past was wiped from the physical possessions I had acquired. I got my change and my life is better, and through thinking that losing my stuff, pictures, irreplaceables, et cetera, all happened for a reason, I could swallow that tragedy a lot easier and quickly move on rebuilding my new life with the change I was looking for.
Things beyond our control happen all the time, the best way to deal is to think something equally better will come along and cancel it out. Dwelling on negatives gives it power to rule your world, so does dwelling on good things. We all need to see things from perspectives we can't or won't create for ourselves. We see tragedy, and turn it into providence. A providence we just don't understand yet.