My initial post was very incorrectly formulated, but that's because to formulate question correctly you need to know at least half of answer, which I did't know at that time.

You've answered your own question why people put unreliable and not-secured code in CPAN: because to formulate something correctly you need to know at least half of answer, which you did not know at that time. People put code in CPAN for different reason and different purpose and different contexts. Therefore their priorities are different, while in your case, it's reliability and security.

My initial post (and most comments) was deliberately designed as rant, because I've feeling I need much more than usual 3-5 comments to find answer. I'm sorry about this, but it's worked! :)

You've just made a very bad reputation of yourself by doing this. There are a lot nicer ways of getting a lot of comments from fellow monks than what you've done here. Social skill is a lot more important than programming skill when you are in a community, online or not.