Think about this a little.
What are we all (rightly) praising about the city right now? How a bomb brought everyone together, the taxi drivers, both football clubs, blood donors, bars, shops, hotels, all coming together.
Why does anyone think bombing the middle east will have a different effect? It doesn't matter that we think they are insane and their ideology is warped into madness, they react the same way. They come together, they say they will be stronger together. Just like we do.
You cannot 'destroy an idea' with force, cutting off the funding (Wahhabism is funded directly by saudi arabia and ALL of these terror groups proclaim themselves wahhabists) and isolating the true powers behind all this.
Until we are prepared to take on the source by isolating them from the world and stopping them exporting hatred, then this will never end. Cutting off the saudis is far more useful than seeing what you posted on facebook.