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I work in high frequency trading and write said "bots". This is a very tightly regulated market and market manipulation (which is what you described) is a felony crime with very large penalties. Not only is the government watching over the players and constantly trying to catch them doing smth wrong (with exponentially increasing penalties and decreasing thresholds of what constitutes a wrong), but the players themselves are very vigilant of anyone else pulling a trick on them and everyone is incentivized to report the violators. So no, it's not the "bots", it's people.
And to the last poster - if you think about it a little - predicting the future is harder the farther into the future you aim to predict. So in fact many more people can predict what will happen in the short term than the long term.
Finally, the advice of putting money in an index fund and not looking at it cannot be overstated. Anything else you do is pure gambling and thinking otherwise is a delusion.
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