FA is a difficult faction to play. You have to walk a fine balance between outlaw & lawful. Example: At Kabukicho you can take kill-Kishiro missions, bankrolled by Samura. But take too many and you risk Kishiro becoming red. If that happens you'll have the whole Kusari law against you as well.
Killing foreign traders is ok, especially Bretonians (but then what they are doing in Kusari?)