Where do you get the idea you don't have that right?
It'll come to you when the guy coming out of the window--who may be the owner of the house--perceives YOU as the threat and shoots your ass.
Mistakes happen all the time. Doesn't mean you lock yourself up in your house for fear of ever making one rather than doing the right thing when the situation calls for it. The mistake you describe, however, seems so low probability as to be absurd, all factors considered.
