This is laughably false. Different PE firms (and funds within them) have different strategies, some firms may indeed by the aggressive kind that you specify, but a lot of them also help the firms growth by providing capital and management guidance. There are different stages in a company's lifecycle at which a PE firm can enter and different outcomes. A lot of PE is in doing the complete opposite of what you suggest; the focus is on improving the business and increasing cash flow while removing any obvious inefficiencies.