The first duty of a moderator is to welcome be polite to new players.
A Moderator is a rank is a trustrank to serve and protect the players, a helper. The Moderator rank is not for filling the moderators chests or friends chests with diamonds, endereyes or other things. That is utter cheating.
There is of course nothing wrong with welcoming a new player, helping a new player building a house or planting trees or help someone that have been griefed.
Commands/softmute <player> - Mutes player without their knowledge of the mute.
/separate <player1> <player2> Stops heated discussions between players
/gamemode 2 <player> - Stops griefing
/tp <player> 6 6 6 - The tower of rules for griefers
We have a no-ban-policy. Use ban as a last resort only for server protection i.e. hackers and spambots not for annoying players or ordinary griefers.
Trolls and Griefers
Most of times mods does not need to do anything when someone swears. We have plugins that do the job. We have also automated protection against most cheats.
Trolls and griefers, players who continues to swear and/or insult others are violating the rules of the server should after warnings be demoted, muted or even kicked. We have a no-ban-policy because the objective of the server is to spread the word of God and the violators is the people that really are in need of the Word of God.
A Moderator can for example warn by telling an offender:
"This is a warning. You have broken the rules please read the rules, do /rules."