"Thou shalt not kill" = offensive

This Dutch Blogger has the following report (in English):

...artist Chris Ripke painted a mural stating 'Thou shalt not kill' on a wall opposite a mosque. It was, of course, a protest against the assassination of Van Gogh. The mural also included a dove, not exactly a ferocious or hate-inspiring animal. According to a letter by Nottroth on Van Jole's site, Ripke used his own wall for the painting.
After complaints from the mosque, who deemed it offensive, the police had it removed. According to Van Jole's site, mayor Ivo Opstelten of Rotterdam sanctioned this.

I understand the visitors of the mosque may have felt especially targeted by the mural,

"Thou shalt not kill"

but the only proper reaction would have been "WE AGREE!".