SO not true. The relationship between two contracted parties is a delicate balance of respect, and service. Life, itself needs balance, and business is no different.
I provide a service, and clients pay for it. If they choose not to pay, then the balance is upset. The respect is lost, and something must be addressed. In all my years of of employment, I can count on one hand the times that I was on the loosing end of a bargain. There is no way to guarantee any job, no matter how sanctioned , or seemingly secure. Tenure, seniority, partnerships ... all can be dissolved. Huge businesses go bankrupt. CEOs get canned. As a sole proprietor, my job is more secure than any other ... because I have the best HR rep in the biz, and he's always got my back.