[feseEscaple]

I think the reason why an external wall is more prone to be disrespected is because it's outside, where everyone, Muslim and non-Muslims, animals, forces of nature etc are. Like I mentioned before, I don't think rain or dust would be too much of a factor. What I think is the most concern would be non-Muslim disrespecting the word of Allah. It's a known fact all over the world that people spit, urinate, and drink while leaning against a wall, among other things.

A person has control over who does what in their own homes, shops, and for the most part, the masjid is usually only visited by Muslims, who will of course not disrespect the ayaat of the Quran. Historical buildings like mentioned are supervised, and it pretty rare to have a Quran decorated building just around the corner. As for objects like daggers etc, these are usually for decoration, aren't they?