Most people on TV have an agenda to some degree. For example, if someone on TV says a stock is going to tank, they may be looking for their audience to sell the stock so they can purchase it at a lower price. They need a large group of people to change their persuasion in order to have the stock decline. They are looking to move the market.
The same happens in reverse. If somebody on TV wants the stock to go up so that they can sell it, they might try to build up a stock and talk about how great it is with the intent of selling it once it does go up.
That is the nature of the stock market. People don't always reveal what they're looking to do in the future. It is wise to stay away from the TV channels that discuss stocks, unless you are able to view it neutrally.
It is more effective to read the company's earnings reports and website in order to learn what actually is going on within the company, rather than focusing on one person's opinion of what is happening with the company.
People are willing to manipulate others in order to make the stock go up or down. It is important to be aware of that fact and to trade according to your research and rules rather than what others say.