Let me preface this by saying nearly all of my personal experiences with bandits have been positive, the players involved were willing to actually go along with a narrative, and things worked out in intriguing and beneficial ways for each party, however, there are many cases in which (at the fault of either the bandits, or the bandited) this is not the case, and within the context of these situations, nobody wins.
Bandits as a whole will never be entirely beneficial, nor will they be entirely detrimental to the community as a whole, as with everything in life, and within the context of the server, interactions vary immensely on a case by case basis, and curveballs will be thrown. In the case that you are bandited, or are banditing, what you need to recognize and understand first and foremost is that if you work with the opposition, you are far more likely to come out of the experience with a new, and interesting interaction under your belt than you are to come out of the experience with a shitty modreq and a d40. Now, to be entirely frank, there are bad bandit players on the server, just as there are bad 'victims', and working with these sorts of people will always be difficult, however it is important for you to realize that if you are in a circumstance such as this, dealing with a bad player, (whether it be a protagonist power-gaming victim, or a power-tripping bandit) that you need to be the better person, if you give into your internal desire to rage against the situation, things will only become worse for everyone involved, and you are even less likely to walk out of the situation satisfied.
Ultimately, you can't win every encounter, life will throw you shitty punches sometimes, and you'll have to deal with them, but if you get handed a shitty round, and you take the high road, it says an enormous amount about your character as an individual. Remember that respectable people attract respectable people, and vice versa, shitty people attract shitty people, and even if things don't go your way in the short-term, the way you deal with the situation is liable to have a hand in the way future situations play out.