Converted?
Dunno, but there is or certainly should be a presumption that this kind of senseless, unprovoked attack and mass killing are done by a Islamic jihadist.
The link below is a list of 93 deadly Islamic terror attacks made on American soil since 1972 that supports such a presumption.
https://www.thereligionofpeace.com/attacks/american-attacks.aspx
From what I can tell, the Lying Leftist media has been mainly silent about the possible-to-likely-to-proven Islamic sources of the last two mass killings (in LV and NY), so we certainly don’t look to them for the info..