There has been some question as too the justification of that R.
Equivalent teen movies have similar language...certain action films have for more graphic senes but Matrix recieved an R for some reason.
The Wakowski Brothers were influenced to heavily edit the first draft of the script to bring the movie a P-13 rating and the violence was scaled back for the same reason.
In the end they rulled the R rating was justified for the gun play nature against uniformed authorities.
(this was word of mouth)