In our modern society, you can get sued for just about anything. All it costs is a couple hundred dollars to file a lawsuit. If you are starting a business, you need to protect yourself.
Given the number of lawyers [including me] and lawsuits in the country, most business owners know it is wise to open a business entity to protect their personal assets from lawsuits. By definition, businesses offer something to the public be it services or goods. Inevitably, a problem arises. The problem can turn into a full blown dispute and then lawsuits are filed. If your business is not protected by a business entity, this can result in a judgment that can be collected both from business assets and your personal assets. In short, a disaster. Forming a business entity creates a shield that protects your personal assets from such judgments so long as you stay away from general partnerships.