Is there a meaning to all this, what is the purpose?

I have struggled for the last couple of weeks, struggled to understand why things happen to the people they happen to. On tuesday the week before last a friend went out with a mate on an early, 5.30 am morning cycle ride. Less than 2 km from home he hit a rock lying on the road that in the just pre dawn light he didnt see. It threw him off his bike onto his head and he died almost but not quite instantly. He was 48, married with 3 teenage daughters whom he totally utterly adored and lived for. One of the best guys I have ever had the privilidge to know.
I have struggled with Tony's death, I have ranted and raved at the universe when there are so many other people that are a total waste of space why does a guy who loves his family, lives a simple life, loves the simple things and is loved by everyone, why was it his turn? What sense is there in that?

My son is 17, he has an 8 year old half brother whom he sees when he visits his dad every second weekend and in the holidays. Although there is an age gap Ben is very protective of his little brother.
Little brother's Mum doesnt live with the dad (my ex-husband) anymore, hasnt done for a number of years but the boys spend time together with their dad regularly and Ben has always got on ok with little brothers Mum. Ben is with this dad this week and little brother is there too. They took little brother home to his mum yesterday and now comes the sucky part......little brothers Mum has terminal cancer, her pancreas and spine, and at 47 has been told she has 12 months max. She is a single mum with an 8 year old boy. Where is the sense in that? What purpose is leaving that little 8 year old boy without a Mummy going to serve?

And so I question reason and sense right now and wonder if there is a god or a higher power and if they are so benevolent why dont they interfere with our lives occasionally so that these things dont happen to the people they shouldnt happen to?
I know this sort of thing happens to people all over the world every day, I understand that, I understand terrible things happen to the least deserving of it at times and I bet they question the sense of it too.