Starting a new job can be a risky venture, especially if you're becoming self-employed. Self-employed means bearing all the burdens yourself. You invest in materials, training, transport and advertising. You put in the time, energy and enthusiasm needed for success.
That's a huge investment for anyone to make. And it can equate to huge losses when things go wrong. No one wishes ill on any one, but bad things happen, even to the best, hardest working people among us. Jobs go bad, people get hurt, or even sued. If you're your own boss, you bear the cost of those events as well as the more day-to-day costs of operating your business.