If Hitler appeared today, even without being stuck inside a box, he would not be able to start WW3 or grab power. Hitler is not that powerful. And being stuck in a box would be a significant constraint on his power.
He was powerful enough to grab power in Germany in 13 years, even being inside the box of his cranial. If he will be a little bit better now (but not a superintelligence), just ideal psychopath, he (or his equivalent) could be even more effective.
If Hitler appeared today, even without being stuck inside a box, he would not be able to start WW3 or grab power. Hitler is not that powerful. And being stuck in a box would be a significant constraint on his power.
He was powerful enough to grab power in Germany in 13 years, even being inside the box of his cranial. If he will be a little bit better now (but not a superintelligence), just ideal psychopath, he (or his equivalent) could be even more effective.