The terror attacks in Brussels today killed at least 30 in bombings at the airport and on the metro system.

It continues the modern blight of Islamic State-sanctioned attacks around the world, from Syria and Iraq and Turkey to Paris, Belgium, North Africa and California.

The first impulse is to cringe. If only we lie still, the bombs or bullets will not reach us. If we stay in our houses, perhaps we will be safe.

The second is to attack. Deport perceived enemies, bomb them, kill them.

The rational approach, once those two extremes of emotion have run their course?

Carry on.

The idea that it now is too dangerous to travel or attend social events is a silly one, considering the vicissitudes of fortune always at work in the world. Automobile accidents, natural disasters, plane crashes.

Even here in France, which has seen attacks large and small over a decade, no one is going to ground. Six thousand people turned out for a Cirque du Soleil show last weekend. Tens of thousands see Ligue 1 matches ever weekend. The European Cup will go on, come June.

So many ways to meet your maker and so many of them far, far ahead of the puny striking force of fanatics.

Paris has been roiled by terror once in 400 days; the U.S. has suffered terror attacks by foreign forces twice in this century; England once in a decade; Spain, the same.

That does not present a critical mass of incidents that would call for us to close the shutters, lock the front door and stay home at night.

What we ought to pursue, barring some enormous surge in attacks, is what we would have done before terror became a global phenomenon.

Planning to go to Paris? Go. Enjoy. Eat on the terrace; see a show. Same for Brussels. And London. And New York.

Granted, places exist in North Africa and the Middle East that the traveler probably should avoid, at least for now. This is not the time to visit the Krak des Chevaliers castle, in Syria, nor to try to tour the failed state called Libya. Saharan and sub-Saharan Africa are better left for another time.

But Europe and the Americas? East Asia? Feel free.

Today, 30-plus people were in the wrong places at the wrong time. But the manner of their demise — at the hands of terrorists killing indiscriminately — cannot be predicted, cannot be anticipated and may not happen again for weeks, months or years over a wide range of territory.

Do what you would have done before the current scourge of violence existed.

Every day life is a risk, and agents of terror have heightened the danger by about 0.00001 percent. Even if it feels, for the moment, like more.