Nor to me, either. IMO sounds like total college drama. IMO I think it's important to remember that we're looking at this from after the murders and seeing only from that perspective, but M & K didn't know they were going to be stabbed to death later. IMO they were totally normal, albeit a little tipsy, at the grub truck. So IMO I think it's key to trip back to being 21, in college, having social and romantic dramas, all of which are of utmost importance until they aren't, and seeing it through that lens. JMO of course, but I can riff a bunch of different scenarios about the 'everything', and none of it in the least bit nefarious.
MOO, I've not seen anything about their lives that strike me as abnormal or implicitly nefarious. Of course, all these seemingly innocent connections and interactions should be examined by LE, but none of what the public has been made aware of seems at all indicative of anything significant.
I do wonder if, even with all the additional info they have, LE is having the same problem? I wonder if every relationship and interaction they investigate is providing nothing to indicate a "personal" motive for the murders??