So lets focus on companies that are troubled and in the news and shares tumble..... i guess i want to buy on bad news stories, give it three months and get out... is that viable?
No
because your business model is based on the belief that you are cleverer than everybody else, and will be able to buy at the bottom of the market, and sell as it rises, and that the rest of the world's investors will not think of doing it, so you will outwit them all.
Have you any reason to suppose that is true?
Do you have any special knowledge about these companies that mean you are better able to judge value than everyone else?