Package managers do not magically solve the problem of malicious programs, just as their big brothers, app stores, don't.
Of course you fully ignored the main point, which is that Linux protection features are completely out of sync with the needs of a modern single user desktop, being ballast instead of a benefit.
In response you seem to enter panic mode. Your last line even denies me reasoning, as if I can't have an argument unless an alternative exists.
So I guess you are exactly sensitive in the way I explained, presumptuously assuming Linux/Unix is the only true OS, employing the best minds, the winner. And more wishful and dangerous thinking like that.
The fact is Linux doesn't care about the user unless he is the sysadmin. Linux is the sysadmin wet dream. But you know what? People hate the sysadmin, and don't want to be one. They do not buy the gospel, and ultimately that is because Linux is an ideal not of this time and age. Linux is a castle, not a house, not a place to live in.
Linux was heavily inspired by Unix but it's not Unix in any sense.
Rest of Unix certified implementations are however not widely deployed. I don't see many AIX, Solaris production machines anywhere since everyone often deploys Linux instead.
Same story applies to *BSD family.
The only thing that keeps the Unix identity on those system is the Posix interface which is also extremely outdated on modern systems and it's kept around as a legacy.
Linux is Unix in the sense it implements most of the same core ideas in a similar way. The same applies to macOS, which is a layer of BSD on top of a Mach microkernel. All those systems have much more in common between themselves than anything else.
