Is it even possible to label as "bad behaviour" something that is allowed on the blockchain?

It shoudn't be labeled like that.
Alice wants to rotate a wheel clockwise and Bob counterclockwise. None of the two is bad.
Nowadays we are saying, let Alice and Bob compete for the wheel, because competition is so great.
Instead we should provide two wheels, one for Alice and one for Bob.
But each wheel should be connected to a small generator to produce elextricity supplied into the same power line.