Wasn't it after police went to Manheim Twp HS that they announced for the first time that they had some leads?
If so, that tells us something -- something was going on at the school.
A male acquaintance of Kevin's, I'm thinking. A fairly good kid, outwardly, but probably not nearly as intelligent as Kevin Haines. If you can get into facebook.com, look up Kevin Haines under Facebook groups to see the memorial "wall" a friend made for Kevin and his family. There are a lot of comments, but they often run towards "I didn't know him well, but he seemed like a great guy, really smart." The "really smart" being a running theme.
Whoever killed the Haineses has been priming himself with violent movies and video games. The person will prize stealth and quiet, and be pretty sly, even though he's criminally unsophisticated. There may have been some personal cause behind the murders, but I feel in the end that personal cause may only be a pretext.
I get the feeling that maybe the person who killed the Haines family wanted to see if he could really kill, after all.
Now that he has, he is very dangerous, and grows more dangerous the longer he remains free.
It could have been a transient looking for money who got caught in a burglary, yes. I don't think it was a "hit," though, and I really don't think it was any sort of gang thing.
I also strongly doubt any connection between Maggie Haines and the murders, and Hbgchick made the strongest case as to why we should doubt that above. Whoever killed these people just didn't know that Maggie was there.
A lot of people are praying for Maggie, too. I'm sure she needs it.
Steve/Mr. A