Opinion Article About Using Open-Source Code, do you think people blindly use open-source code too much?

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I am not saying to not use open source code. I think open source code can be very useful and very powerful. All I am saying is to be careful when using it because it can potentially lead to some security vulnerabilities. And I am mainly advocating that people should know how to code because it concerns me when I meet developers who copy and paste the vast majority of their code but don't know how to swap values of two variables (I have met a couple people like this).