“Who the fuck knows what I just installed?”

This is honestly a great question; you’re on the right track here.

With closed source, the person that wrote the program decided that it should be impossible for you to answer that question.

With open source, the person that wrote the program wanted to make sure it is possible for you to answer that question.

Which of those 2 options is better and safer? I’ll stick with open source, personally, but install whatever you like on your own machine.