being personally accountable yourself is the best way to set example and encourage others to follow suit.
That' s what the Buddha did. He lived his life in full accountability, and eventually he was completely surrounded by others who wanted to live the same way.
If you live a life of personal accountability and others like the results you' re getting, they will emulate you and become personally accountable as well. You will influence others through a process of attraction and osmosis, not scolding and evangelizing.