And most of all, the people that are part of the project are also likely to be malicious because trying to infect someone is the only valid reason to recomm

And most of all, the people that are part of the project are also likely to be malicious because trying to infect someone is the only valid reason to recommend this method of installation. This lacks any empathy. One valid reason: large projects (e.g. rvm) have proven over time to not be malicious. It is far easier for a user to copy and paste one line than any other install method. This lowers the barrier to entry and reduces support requests for the maintainer. Having an opinion is fine. Disagreeing is fine. Pretending like your answer is the only reasonable one: not likely to win over many people.