I think there is a possibility of that being the case.
How would the random burgler know how to get in ?
Why would the random burgler break in when there were five people in the house ?
Why would a random burgler shoot everyone. Women, children, old men etc. Burglers go into houses to take stuff. Not to massacre.
What was the random burgler going to take ?
Julie said Jeremy wanted to use Sheila as a scapegoat. I believe her.