As someone who also had to start from scratch at 30, the idea of it starting over is much scarier than the actual act. I find it really refreshing to be able to redefine yourself and your priorities.
I think that people are so against starting from scratch because they are focused on what they will lose, but give little weight to what they are willing to gain.
Starting over or removing negative energy from your life really does build you up. It helps you concertize your values and understand your boundaries.
It further defines who you are, what you stand for and what you are no longer willing to put up with.
Everyone should have the opportunity to start from scratch because it is a liberating experience.