While I'm all for the alleviation of ignorance, I'd have to say "no" on the grounds that truth is subjective, and forcing someone to believe something is very much enforcing falsehood due to the value of truth being subjective. By that I mean if your truth is different than my truth, it may be a very good thing, as I doubt that either of us are so very omniescent to have a whole understanding of the real truth, and consequently we can get closer to the real truth by acknowledging the value of eachother's. That said, there does not exist a truth which you could force them to believe that would be beneficial, as it would simply destroy a valuable perspective: if your truth is equal to my truth, we have nothing to learn from eachother.
That said, this technology already exists, and is employed by many organized religions. The mechanic is very simple. Once you determine the "truths" that people should believe, kill or severely oppress anyone who won't be swayed to believe this truth (at least on the surface) and the resulting fear should help to bring about change in the rest of them. Crude, but effective.
A machine that literally forces people to think this or that would save a bit of bloodshed, which is good, but is only a more efficient means to the same, wrong-minded, end which only ends up fostering ignorance instead of obliterating it.
A better path is to do the opposite: teach people to be a whole lot better at thinking for themselves instead of relying on others to tell them what to think. (E.g. Promote critical thinking.) This does not impede their own capability to determine their truths subjectively while enabling them to be able to determine if what they believe is delusion through having fostered the skill set to do so. This is the means applied by modern science, the knowledge of the scientific method [http://en.wikipedia.org/wiki/Scientific_method] is only this, a core tenant being that there is no truth discovered that may not be disproved in the future, and the wonders science has produced is evidence enough that it is a much more beneficial path.