I don't mind having a script that sets up the environment, there is a lot of software out there that does have these set up scripts in the tarball, or is distributed as a self-extracting archive, but you can always see it is marked as such. What I really balk at is "run this random script, trust me it installs". Would it kill them to write "download this script which will run apt-get pkg1 ... pkg10, then extract an inline tarball to ~/.local/lib"? I'm not going to run a random script that I have ZERO idea what it will do. It's not about security, it's about knowing that a good-intentioned non-compromised script won't crap all over my environment.