THE worst response to a tragic and horrific attack like that on Paris would be one that strengthens Isis.
When President Francois Hollande said we are at war with Isis, he was right. But it is a war we can only win if we don't get provoked into the response they want from us. The response they expect.
Parisians are sadly becoming all too used to this kind of violence.
It was only in January this year when the attack on Charlie Hebdo left most of its staff dead or maimed.
And now this, an attack so ferocious and brutal that Paris may take years to recover.
How does the Paris attack make you feel about your safety?
This poll ended on 30 November 2015.
No different. These were isolated extremists who want us to feel scared. I won't let them win.
A little unsafe. This could happen anywhere, with any target.
Really worried. I don't think Australia is prepared for an attack like this.
It makes me less likely to visit Europe, but I feel safe here.
This is not a scientific poll. The results reflect only the opinions of those who chose to participate.
Seven years ago, to this very month, gunmen also ran amok in Mumbai and unleashed terror that was to last four days and claim 164 lives. This is global war, and and it could be very well be a generational war.
As I watched the horror unfold on TV last night, I was asked: "why are they doing this?" - which seems like a naive question but is actually an excellent place to start from. If Isis were indeed behind this (they have now claimed responsibility) - why would they do this?
Isis are doing this to provoke us. They want us to attack them on their soil: in Iraq and Syria. They want to see western troops back in those lands because the chaos and backlash that would create would play directly into their hands. It would create countless new recruits for them.
Isis are also doing this to create division and exploit tension in our modern multi-racial societies. They want western Muslims to feel unwanted in their homes in Europe, and to instead join them in Syria.
They want western Muslims to feel that they can only truly be at home at the Isis Caliphate.
And Isis want to see western countries become closed, authoritarian societies where we live in fear of them and their capabilities. They hate what we stand for and they want to provoke us into changing that.
Isis are doing this to provoke us. They want us to attack them on their soil: in Iraq and Syria
The temptation to react to Isis in the way they want will be strong in the aftermath of Paris. Francois Hollande says our response to Isis must be "merciless" - and I agree - but it must also be strategic so we don't fall into their trap.
We must stand for our values: liberalism, secularism, openness, free speech and equality: those are the values we swear by and those are the values we must now strain every sinew to live by.
When Chancellor Angela Merkel said Germany would offer shelter to Syrian refugees earlier this year, Isis released a dozen videos in panic, encouraging Syrians to come back.
But the damage was done. Syrians saw that Europe was more willing to offer them refuge and dignity than many Muslim states. That they were not heading to the Isis Caliphate was a slap in the face.
The attacks in Beirut and Paris is their response. They want us to brush away humanity and compassion with suspicion and division.
By following that script we do exactly what Isis want us to do. The destruction of the Isis Caliphate must happen, but it must come from a Muslim-led force. After all, ordinary Muslims have been its biggest victims.
That isn't to say we must do nothing. We have to challenge Islamism and its sympathisers in the west, and we have to stand for our values.
There's also no doubt we must win the war against Isis. But we cannot win it if we're provoked into the response they want. We cannot win with a response that strengthens them rather than weakens them.