I'm not sure which headline you're reading, but the one here references both "Ford dealer" and "truck with logo" (I had to shorten from "truck with company logo" to fit Hacker News' 80 character limit)
edit: why the downvote?
In a causal sense, the ending up in Syria seems to be a key actual cause, as does the fact that the decal was still present.
Both are probably key points legally, too, as one is the alleged omission, and the other the alleged mechanism of harm, both of which are important to the legal action.