There is no entry or search involved.
Your analogies ("Let's allow the FBI to inspect our homes without a warrant. Pull over cars and search them without probable cause) are not reflective of what is done.
You are rather proposing one cannot look at another persons house and see what is in common between house in a given neighborhood.
No search? Compiling a list of my private phone calls is NO SEARCH?
Here's a copy of the Bill of Rights, since you are low on toilet paper.
Yes and if I am bringing people into my house that might, if revealed, cause me great embarrassment, it would be a danger.
I am simply following your analogy.