Tis true, but synths are also far more intelligent and physically powerful than a normal human. Left on their own, like any child, they could easily cause a great deal of destruction. The Institute's methods are sub-optimal, at best, and their attitudes leave a lot to be desired, but when its a choice between a group who doesn't consider the long-term effects of their actions (Railroad), a group who can't stomach the idea of anyone with better technology than them (the Brotherhood), or a group that you can actually change for the better and whose advancements, in the hands of someone like the Sole Survivor, could easily save the entire Commonwealth, maybe even the Wasteland as a whole, I'm gonna choose the group that actually has a chance at making things better in the long run. Other than the Minutemen, the only group you really have an opportunity to measurably change for the better is the Institute. I just wish you actually could work to restore the Institute's reputation and make them less shitty. Unfortunately, for all the good points Fallout 4 hits, actual player choice is one area they seemed to neglect almost entirely.