What exactly do you oppose? Founders are the original shareholders, so I guess you don't oppose them having control of their own company? Since they are in control, nobody forces them to raise investment and give away shares in exchange for money. In other words, it's their decision whether to introduce new shareholders (either private or public ones).
I guess I oppose the system where we give control of companies to people who put capital into the company. As opposed to the people who run the company, or rank and file employees.