Answer:
It can be used to persuade people into doing or purchasing useless or dangerous things.
Step-by-step explanation:
The four types of rhetoric are Ethos, Pathos, Logos, and Kairos.
Ethos refers to the credibility of someone who is sponsoring the product or action.
"Jane Smith, a professional dentist, recommends Colgate toothpaste."
Pathos refers to emotional appeal and persuasiveness.
"We have rescued many dogs from a cruel testing lab, and we need your help adopting them!"
Logos refers to statistics and logistics.
"94% of users said they experienced clear skin with our face wash!"
Kairos refers to the appeal of time ("now is the time")
"Don't wait! Get your new year's resolutions started with our fat-burning smoothies!"
That being said, someone can use any of these to persuade you into doing good or bad things. For example let's use Ethos. A celebrity could endorse people to shop local at small businesses (good,) or persuade them to buy an unhealthy meal from a fast food restaurant (bad.)