I do agree with that.
But pointing out the domicile status of people whenever something bad happens is a dangerous thing to do. And quite redundant really. They are either bad people or not. Saying they are bad immigrants is unhelpful because it is singling out a group of people in an unequal...
By that logic migrants are bad.
Maybe what folk are trying to say is that lumping groups of people together as a whole is unwise.
Whether the people who did this are migrants or not does not make migrants bad. It means that there are some who are.
If indeed they are migrants- which we don't...