> I happen to know someone well who works for a Korean Conglomerate building industrial/car batteries in the US.

You could just say you know someone at LG ;)

> However, ICE didn't need to arrest everyone. All they needed to do was send a warning. These companies don't want the trouble, they would comply.

The point is to reach quotas. Warnings and voluntary exits don't help with those.

> Now you have many Koreans very upset.

FWIW, the reaction among Koreans (i.e. in korea), especially the younger generation, has been quite mixed. Among age 20-39, only a minority expressed being "disappointed with the US' excessive measures". Among the older groups, the majority did react negatively.