Why do people use Ellis Island immigrants to look down on todays illegal immigrants?

You said one major concern that we have with thee illegals today. They are not checked for diseases!! There were also not the threats of national security there are today. Illegals are not immigrants. Immigrants respect laws and it is an insult to real immigrants to call them this. And the population was not what it is today, they also did not come and live off the services of this country then either.