You can do whatever you want, but another person can use their free will to point out incorrect claims. In fact, in the age of disinformation, it's pretty important to look into claims (say, about safety and performance) made by people and projects, because they're not always to be trusted.
If you really want to get into it, since you are already trusting the author of the project you're pulling code from, you don't gain any security from pulling part of the code from another source. The benefit of your package manager is having to include less code in your git repository, potentially making it smaller, and (presumably) the ease of updating to a newer version.
And I don't know how you went from reading my comment to "screw yourself". Perhaps you should reconsider the way you handle entirely neutral and well-meant feedback.
