It is most important to keep on challenging these would-be censors, so that people with Kalashnikov rifles do not make our customs and laws.
One of the false presumptions of our time is that people on the political left are motivated by good intentions even when they do bad things, while people on the political right are motivated by bad intentions even when they do good things.
When people prefer to focus on the motives of the victims rather than on the motives of the attackers, they will ignore the single most important matter: that an art exhibition, or free speech, has been targeted.
It does not matter if you are right-wing or left-wing, or American, Danish, Dutch, Belgian or French. These particularities may matter greatly and be endlessly interesting to people in the countries in question. But they matter not a jot to ISIS or their fellow-travellers. What these people are trying to do is to enforce Islamic blasphemy laws across the entire world. That is all that matters.