I don’t think Trump Jr was in on the March meeting where Adm. Kubic and Sessions and Page said no to Papadopolous’s idea of meeting with the Russians, so he would not have had the benefit of their criticism of the idea on national security grounds. Papadopolous was sent beck over and over again , however many times it took, to cast the bait until someone took the bait- and someone political and not in the military or intel community would be more vulnerable to the lure.
If unnamed russian woman is that lawyer..they are going for JR