Using pathos while arguing can be one the most influential and persuasive rhetorical techniques available. When a writer is able to appeal to the feelings of the reader than it is becomes much easier to have them support your point. People's actions are a reaction to their emotions. The emotional involvement of the reader out weighs the logic of the argument, making the appeal to emotion the most powerful device. Pathos are used everywhere.
Take for example, you are walking down the hygiene isle in Target searching for the right toilet paper. When you see a picture of a cute cuddly puppy plastered across the wrapper, most likely we would grab the brand that makes us feel good, opposed to the generic label. We choose without considering the actual quality of the toilet paper, walking around with a "puppy" in our carts makes us feel all warm and fuzzy inside for a moment. This is just a simple example but, it goes to show , that pathos is used everyday and everywhere. Whether it be toilet paper at the grocery store or a monumental speech our president makes, appealing positively to the emotions of your listeners or readers will always be beneficial to your argument.