How would non-disruptive students learn to deal with conflict and
social pressures if disruptive students were removed from our nation's
public schools classrooms?

I grew up in the 1950s, when disruptive students were routinely
removed from public school classrooms. Minor troublemakers were sent
to "study hall," suspended, or expelled, depending on the severity of
the offense. If the "disruption" was violent in nature, the police
were called.

I don't think my generation is impaired in dealing with conflict and
social pressures. We acquired a close-up view of the consequences of
disruptive behavior. Many of today's students are essentially being
taught that there are no ill consequences to such behavior, a lesson
that will not serve them well when they enter adult society.