See, that's a common misconception of the Lawful alignment; it does not mean that you unthinkingly abide by every, niggling little ordinance of whatever country you happen to be in.  For Taranis, being Lawful means that he keeps his word, and constantly works toward his goals (increased wealth and personal power) without being distracted.  He really couldn't care less about what the local fuzz would have to say about this altercation.