There have been lots of debates about the cause of Type 1 and many people think "why me?".
I chose not to question why but to look forward and focus what I can do now and in the future to minimise the impact of my diagnosis. I have nothing to gain from knowing if I could have done anything to stop diabetes.
@Toffee1 my advice to you is not to dwell on the past: what could have been and what/who caused diabetes. You have your diagnosis now so invest your focus and effort on what you do in the future to minimise the damage it can do.