How do you force people to choose their hatchery randomly? Is there anything to be gained from choosing a hatchery on purpose instead of randomly?
The hatcher that is selected and the vote (yes or no) are handled by the client software. The actual wallet holder has no control over this at all.
If you were to grab the source and modify it to always vote yes, then even if there were only 100 other voters in the system, you vote can only skew the vote by 1%, which isn't enough to cause damage and will only push up the vote threshold over time.