Declining invitations can hurt a person's feelings.
Simon plans to invite all of his friends to the party with him.
Simon wants to have fun at the party.
Simon doesn't want to force his friends to show up, so he only invites those he's sure want to come.
Simon invites all of his friends with on to the party.
Simon's friends are glad the don't have to decline an invitation and risk hurting Simon's feelings.
Some of Simon's friends don't want to come but don't want to decline, so they come anyway.