'Do' is not simple present. It is not even indicative mood. It is imperative mood .
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Mister MicawberWhy do you play?-- Generally. The listener is probably not playing now.What about these?
Why are you playing?
Mister MicawberDo you see that man over there? -- Linking verbs, verbs of sensation, and a few others appear in simple present for a current activity. See your grammar book for a list of these verbs.May I ask is 'fulfill' one of those verbs? It is not listed in my grammar book.