They had their reasons back then. They were concerned about espionage.
When viewed through the filter of time, it looks like an indefensible
action. But at the time, it was a reasonable thing to do considering the
circumstances.

At the time, it was very similar to the way one of our enemies was treating a
portion of the population that particular government distrusted. Round em up
and imprison them all, sell off their property to the highest bidder belonging
to an approved race. There is no comparison between how
Germany ultimately dealt with a few million of the Jews and how the US and
Canada treated our Japanese citizens- most of those who went to concentration
camp in North America were ultimately released. In fact, all except those who
died from one (nonviolent) cause or another while in camp.

Did you know that some of he interred were second or latter generation
Americans? Many had never been to Japan, were not fluent in Japanese, and were
certainly no more of a threat than the
millions of German American and Italian American families that were descended
from other Axis peoples. The German and Italian families had an advantage. they
didn't "look funny".