Why the frequent, deliberate confusion of migration and immigration in the West

Again and again, immigrants are (deliberately) confused with migrants in the public discourse of Western societies! How come? It is very dishonest!

Why this presumed cover up of the (uncontrolled) invasion of immigrants?

What is behind this? Let's speculate for a moment:

1. Migrants tend to go from place to place. They are often native to the region where they migrate to and from. They tend to be of the same culture as their neighbors etc.
   While most immigrants to the West are often from a very different part and different culture of the world.
2. Migrants tend to live temporary in one place. They tend to move on or back where they came from.
   While most immigrants to the West want to stay permanently.
3. Maybe migrants sounds less like individuals requiring significant amount of taxpayers money to accommodate their choice of residence and life.
   While immigrants are often the opposite in this respect for sometimes years to come.
4. Migrants tend not to be followed by members of their kin/family to settle down.
   While immigrants will often try to bring their families with them as soon as possible thereby multiplying.
5. When migrants have children, they tend to return to the place where their children are.
   While the children of immigrants follow from the home countries of the immigrants or immigrants procreate where they settle down.