Which logical fallacy is used in the text?
Mr. Delgado argues that we need to do more to prevent workplace injuries and fatalities. I doubt that someone so socially awkward would know a thing about office safety.

 - ad hominem: a personal attack against one's opponent
 - appeal to nature: the assumption that natural things are always good
The text argues that being socially awkward determines knowledge of workplace safety. This is a personal attack that isn't relevant to Mr. Delgado's desire to prevent workplace injuries. This illustrates a type of logical fallacy known as ad hominem.