[Drew68]

Why do I think this was RACIAL and the killer is black?

The victims were killed on the 2nd and 3rd floors of the house.

The sleeping roommates who lived were on the 1st floor.

Why would this racial killer pass up the opportunity to kill two more presumably white college students on his way out the front door?

[fortes fortuna juvat]

Why would this racial killer pass up the opportunity to kill two more presumably white college students on his way out the front door?
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Could be because the killer(s) didn’t know they were there.

[Scrambler Bob]

Why would this racial killer pass up the opportunity to kill two more presumably white college students on his way out the front door?
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It looks like this apartment was kind of like a split level.

You could go in and out of a ‘front’ door on the ‘2nd’ level and maybe not know there was a lower level.

[CivilWarBrewing]

Very important: Where did the killer or killers enter the house?

If it was first floor, then yes you raise a good point.

If it was second floor balcony sliding glass door, then avoidance of first floor survivors makes perfect sense.