Wouldn’t the better filter be to just let the earth go on about its own and see how people behaved WITHOUT the selfishness-extracting incentive of gaining eternal life?
What makes a person happy is only defined by being in the state of having enough good to conquer what they know to be bad.
Limit the bad experienced to control what good should be obtained.
The protective bubble will break often, but the time after the healing will be sufficient enough for the unhappy population to forget.
This system of controlled happiness will also dictate people’s chosen paths in life. In a bubble of controlled happiness this would be most efficient.
