http://diplomacy.state.gov/discoverdiplomacy/diplomacy101/places/170537.htm
You are incorrect. However, you are right in stating that to some people, no crime is too heinous.
I stand corrected, but not entirely. The link you provided states, “while an embassy remains the territory of the host state, under international rules, representatives of the host country may not enter an embassy without permissioneven to put out a fire.”
Therefore, our embassies represent our sovereignty, but not on our own soil, remaining the territory of the host state, but they do remain sacrosanct and inviolate. “Any attack on an embassy is considered an attack on the country it represents.”