How Can This Be Used For Evil?
If you're writing a news story, and want to insert your own opinion, you simply attribute the opinion to some unnamed person or group. Such as "many people":
The writers do not explain who is saying, asking or arguing. Their friends? God? The homeless man outside ranting about the government stealing his thoughts? Who are these people and how numerous are they? What are their qualifications?
We don't know, and in their own mind the reporter can always rationalize it with, "Well, surely there's somebody on planet Earth making that point. Why waste time actually finding them?"
Weasel words can also be used in another way, similar to the way a Straw Man is used in a debate: to introduce an anonymous but supposed common opposing argument which the writer can then rail against, as we have here: