What's the difference between a tragedy and a catastrophe? A tragedy is when a boat full of immigrants sinks, a catastrophe is when all of them can swim.
Are you saying that you think immigrants are not worthy of living?
Yes they should stay in their own countries and not come to the US.
It seems that you have strong feelings about immigrants living in the US. These people are fleeing horrible conditions in their home countries and want to achieve the American Dream. It's not fair to deny them of that opportunity just because they were not born here.