Meteor JS - enable / disable rules

In the example "parties" of the application, there is a set of allow / deny rules for the meeting of the Parties. The rule for is insertas follows:

Parties.allow({
  insert: function (userId, party) {
    return false; // no cowboy inserts -- use createParty method
  },...

At the same time, the createParty method implements Party.insert ({....}), which is somehow not affected by the rules applicable to the meeting of the Parties.

.....
return Parties.insert({
      owner: this.userId,
      x: options.x,
      y: options.y,
      title: options.title,
      description: options.description,
      public: !! options.public,
      invited: [],
      rsvps: []
    });
.....

Can someone explain why the createParty method is not affected by the rules?

Thank.