Answer:
1. The ethical reasons for citation and attribution. Why is it ethically important to cite sources?
Ethically, it is important to cite source to ensure that you credit the correct person for the work included in the citation.
In order to conduct a certain study, researchers have to sacrifice countless of hours. Citing their work without giving them a proper recognition may be as bad as outright stealing.
2. The practical uses and benefits of citation and attribution. Why is it helpful to cite sources?
In term of practical use, citation and attribution could give a certain level of credibility to your statement.
For example, let's say that you're writing a blog post to argue about the positive use of vaccine. Citing research conducted by medical professionals will strengthen your argument over using random people's statement on social media.