You don't understand. There are no rulers. You cannot prevent people doing stupid things. This is fundamental, and hardest to emotionally grasp.
You can, however, use existing incentives to minimize the damage to the system. That's why OP_RETURN is standard: people used to embed data in outputs, which have to be stored forever and be available for fast lookup. OP_RETURN is straight harm prevention. Luke used the coinbase input to embed prayers, which has the same effect, but you have to be a miner.
The only strong incentive is fees. That's unvarnished capitalism, which has the benefit of being *simple* and *distributed*, but it's not *fair*. Assholes with more money than me are a real problem! But not one we know how to solve in a decentralized system.