Because destiny has twice the installed base being a 3rd party game. PS3/4 people who've never played Halo may still play destiny. The question would've been more accurate if it was asked of only 360 and One users
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If you've never played Halo you're a casual.
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Halo is about as casual as it gets, aside from CoD. Go and play some quake and CS 1.6 and then you have the right to call people casual.