For the most part as humans, for the purpose of communication.... While speaking, we use the generic TERM: "THEY", to put the type of persons that fits the description of the subject or point we are making or trying to make into a stereo-type so we don't have to use names nor point fingers. It works, so why question it? Whatever you do...for heaven sake, don't mention "THEIR" name(S) because "THEIR" wrath will appear from nowhere,...."THEY" will call you to the carpet and delightfully put your feet to the fire.
SOURCE: This is according to the gospel of John(F). PS: If I were to change my name to "They", I would be in a heap of trouble....everyone would be talking about me without end. Who is going to read this spiel all the way through? The people of this community...THEY are. Smile.