I tried two different translators and got:
“Which they are neither this nor are those who are”
and
“Neither are those who are, nor are they who are”
Corrected: Ni estan todos los que son, ni son todos los que estan./ Nothing seems to be all that it is, nothing is all that it seems to be.
Point is all gun owners are not at all like the propaganda narrative portrays them and this gun crime perp was a Trump hater.