[lotsofpulp]

> If that's true then the converse is also true: bad students become bad by surrounding them with other bad students.

The converse does not have to be true, only the contrapositive.

And in the case of a human’s tendencies, it is easier to become less disciplined than it is to become more disciplined. Bad habits are easier and likelier to pickup than good habits. Forming a tight knit high trust family/community is much more difficult than dissolving it. Etc.