Logical Fallacies: a Study

[Sigurd]

Here's the thing though with these fallacies, some of them are just absolutely essential in discussion or debate to get things going ... Take appeals to authority, very important in all kinds of matters.

It only becomes a fallacy when used wrong.
Argumentum ad verecundiam only becomes a fallacy when using authority figures that aren't really authority figures, or using radical authority figures which is removed from the mainstream i.e goes against other qualified authority figures.

A great example is quoting Albert Einstein in matters of politics or religion. Now Einstein was a clever guy, but his field of expertise was physics not politics or religion.