Sounds like the bomber watched the movie They Live a few too many times.
The article links above says he mailed a package to an acquaintance two days before the bombing that says in part
"...But [the bombing suspect's] writings grow even more bizarre when he wrote about reptilians and lizard people that he believed control the earth and had tweaked human DNA.
'They put a switch into the human brain so they could walk among us and appear human, [the bombing suspect] wrote...."
SO that means the progressively challenged left will start to whine he was a pesky "RACIST!" and right winger who worshipped the bad orange man?