A mature response is to start discussion ASAP and bring in more information as it becomes known. Entering a state of faux paralysis out of some sort of sense of 'too soon' gets us nowhere. It's also not like terrorist attacks are new to Europe - this one is a bit bigger than normal, but it's not a 9/11-scale outlier.

Yes, because absolutely, without doubt, governments are also thinking how to exploit this situation.

Yes. Now.

Now, because the pressure for new government powers is very urgent, and there may well be action in days, not weeks.

But we need to do so with sensitivity, too, now.

Edit: I'll go with jacquem's reply to NewNole2001: It can wait a day or two. It can't wait weeks, though. (The Patriot Act was passed less than 7 weeks after 9/11.)

Calm down.