A murder is a serious crime. Guede clearly had to break into the house to commit the murder, so he also committed a burglary by your definition.
Which would mean there’s no evidence that the burglary was staged, because that would mean that in addition to the burglary that Guede committed, ANOTHER burglary must have been staged by someone else. Which would usually be instantly eliminated by Occam’s Razor unless there’s a significant amount of evidence of two separate burglaries.
Wait, what? The analogy works exactly; you’re just assuming a priori that the bit you think doesn’t fit actually doesn’t fit. The analogy logically goes that if it’s wrong to point a gun at someone regardless of whether you think it’s loaded because it might be anyway and that would be Very Bad, it’s also wrong to proposition women in elevators regardless of whether you think they’ll accept because the situation where they don’t would be Very Bad.
I don’t know how you missed this; you seem to me to have pointed yourself directly to this conclusion and then walked past it.