That's a good point about Linux but I think your focus is a little narrower than mine. Yes Linux is less virus prone than Windows for several reasons. But I don't think the issue is solely about viruses or installing apps.
I think you can have your macnine attacked or your private info stolen without installing an app. That's why security suite software tries to filter for outside-in attacks, phishing attempts & known risky websites.
But back to the argument that you are safe if you simply scrutinize the permissions that apps are demanding...
Sure a wallpaper app shouldn't have access to your contacts, but an email-related app would. And some other app might logically request access to your file system, no?
In either case these could be bad apps that want to misuse your device or steal your data. And they could even be from big "trusted" companies... like Sony.
And finally, if you happen to have rooted your phone, doesn't that just decrease Linux's standard protection level.
All in all, it seems smart to have extra security layers, as long as they actually do something and don't overly tax the phone's performance capacity.
... which is what prompted the OP's question and my follow-up about the current crop of security software for android.
You destroy your argument with this post. In the case of your bad email app, none of the security software will help you. An AV app won't detect it because its not using a malicious code signature. Droidwall wouldn't help you because it needs to connect to the internet to work. On and on. So how is it acheiving anything?
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