Because it probably assumed he meant the foot that wasn't on the ground because you wouldn't ask that question unless one foot was not in an expected or typical place.
'Because it probably assumed... ' Thats kinda the issue tho, How would it know which foot the person was asking about and why would it assume that without requiring further input/data/ information to clarify before answering. Logically the more important foot is the left one, holding him up from falling - simple biomechanics. Answering 'Where is his foot' is almost an absurdity without requiring more detail. The question is a 101 logical fail. It suggests that the AI was programmed either with (illogical) bias or inputs to essentially to pre-answer, ie scripted. If the AI were to have asked 'Which foot do you mean, obama has two feet in that picture' i would have brought more into this charade.
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