You're asking a question about a group as if it were an individual.
Market Makers are brokerage firms. Some of the people in the firm watch charts, and some don't. For example the trader(s), the guy(s) that execute(s) the trades for the firm, are way too busy to watch a chart. They know what's happening anyway, because that's all they do all day for the past [fill in the number of years].
Additionally, just because some firm makes a market doesn't mean they have any influence over what will happen. Some firms make a market in a stock but their clients don't trade much of it.
And, firms won't tell you they "manipulate" the stock price. That's against the law. What they have to do, also by law, is "maintain an orderly market".
You get to decide what "manipulation" is and what "maintaining an orderly market" is; I've never been able to tell the difference. Maybe it's "too much maintaining is manipulating", I don't know. (Of course, doing things like buying and selling without actually buying and selling, just to show a trade, is a little more than "maintaining"...)
In any case, a firm that is making a market in a stock is much more interested in the volume and their commissions than they are in short-term fluctuations of the stock price.
Let's say a firm's clients own a lot of some stock, and that firm also makes the stock. (They say, "We make the stock", not "We make a market in the stock", by the way.) The people who control that stock are client's brokers and the bosses of the brokers. It's possible that the brokers are given "suggestions" about whether to buy, sell, or hold by the higher-ups in the firm. These "suggestions" can have a significant influence on the price of the stock.