I don't care for such a day for free speech.
The important things are others.

Let's mention a history of cause and effect:
If the Western nations didn't invade and exploit the Muslim countries, leaving a mess of corrupted elites behind when they left, we wouldn't have any problem with such extremists.
Means, if the Western nations wouldn't take the freedom to colonize and ruin other societies, the Western individuals had no reason to fear to use their freedom of speech.

Don't get me wrong, I don't like extremists, I don't like killing or hurting or bombing or other violence, and I don't say that they are doing right, they are idiots, but to make idiots a general problem, you need a swamp where they are growing, and those idiots got their swamps to grow, and the Western nations had their chance to avoid the arising and expansion of such swamps, but they didn't take care.
That's it.
It's nothing but the foam at the peaks of the waves of mud many people in the Muslim countries are forced to live in.