Asking people to be nice has been tried before. It does not work on chain-wide level.
I am not suggesting that we 'ask people to be nice'. Rather, I am suggesting that we change the rules so that the differential in payout from 'gaming the system' is not much greater than 'playing nice'.
The other advantage of incentivizing delayed-voting bots is that those bots can play a significant role in flagging and 'calling out' those that aren't 'playing nice', ultimately leading to the shunning and thus exclusion of such 'bad' behavior. This power is accentuated if content creators are allowed to reject upvotes they suspect are being made in bad faith, thus forcing the 'offending bots' to merely play by themselves, in their own sandboxes (amplifying their own rewards slightly, but not adding noise to otherwise valuable curation efforts).