it's not an "accident" if you randomly round up people based on nothing, then exile them to a foreign slave prison, it was a deliberate series of steps to terrify these people and everyone else.
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Due process exists for precisely this reason, and Trump and his band of sycophants intentionally bypassed due process as a "show of strength". An example. A wilful accident.
There were already processes in place so that exactly this kind of accident does not occur.