But what if the entirety of people making themselves obstacles to a kinder world actually start to push the world away from kindness? What if they force the world towards hate until that hate breaks the world, wars are started and thousands die? Are those obstacles still to be respected?

In other words, how does the statement in the OP stack up to the paradoxon of tolerance? “If you are tolerant towards the intolerant, you will find the intolerant break your tolerant world.”