I think you are. If you buy a stock, you support the value of the company on the stock market. This, in turn, increases the likelihood of the company to raise more money.

(Same as if you’re against killing animals and buy used leather. You support people who want to sell used stuff and, thus, indirectly producers of leather.)

If this were actually true, no company would go to all of the pain and hassle of offering stock in the first place.