Good Information Is Expensive
It's easy to get the idea the you can get good information freely from the Internet. However, you'll usually find that, it it's truly quality information, someone has paid for it. In the case of government websites, it might be paid for by your taxes. In the case of high quality medical information, it might be paid for by generous grants from philanthropic organizations. In the case of the library's databases, it's your tuition dollars that pay several hundred thousand dollars per year for access to journals. Sometimes organizations provide information that's paid for by their membership dues.
The kind of superficial information that's usually found on ".com" websites is actually advertising for the sponsored product or service. It's usually biased in favor of whatever is being sold. This information will not add to your credibility as a writer.
In addition to the reasons given in the "Why We Cite" video, it is in fact illegal to take copyrighted information without properly citing it or getting permission. Copyright laws apply to any source of information, music, journals, videos, photographs, illustrations, etc. Taking information without citing it is plagiarism. Aside from being dishonest, plagiarism carries harsh penalties.
As an example of the cost of information, it may surprise you to know what the library, through your tuition, pays for journal subscriptions. You can get an idea of some of the expenses of criminal justice journals by looking at the Literature of Criminal Justice webpage.