If there are one hundred possible reasons to buy a stock, there are thousands of possible reasons not to buy one. There are times when companies face existential threats which seem to have no effect on their stock's price. There are times when a company's stock is simply less attractive than a competitor's stock in every measurable way. There are companies with criminal records. There are companies that make things that no one would ever want to buy.
Each of these companies is publicly traded and each one has a stock. In each case, you are free to buy as much of the company's stock as you can afford, and in each case there exists, as far as I can see, no rational argument in support of doing so. In some cases, aggressive contrarian investors might consider short selling the stock, but in others cases the stock is too low to short sell for much profit.
The first company on the list is one of the most widely followed in the market and hence my most serious warning.