Because your assertion was unsupported by law or facts.
Eh, what?
The 1st Amendment was incorporated to the states by SCOTUS.
The 3rd Amendment has not been incorporated because it hasn't been an issue.
The 4th Amendment was incorporated to the states by SCOTUS.
The 5th Amendment was incorporated to the states by SCOTUS.
The 6th Amendment was incorporated to the states by SCOTUS.
The 7th Amendment was incorporated to the states by SCOTUS.
The 8th Amendment was incorporated to the states by SCOTUS.
Now, kindly explain why the 2nd Amendment will/can not be incorporated to the states by SCOTUS?