What good would military do if used now in Spain domestically?
All options must be employed, each in their areas of effectiveness. The law enforcement angle helps us to track and disrupt the funds and organization of the cells within law-abiding nations. The military option allows us to close off access to training and safe havens for the terrorists.
And no, invading Iraq wasn't a big step either in the fight against terrorism: It might have even opened up a Pandora's box for the radical Muslims to gain power (I will hopefully be proven wrong there)
I believe you will be, in the long run. Iraq isn't a pandora box, it was a festering wound. Sheerly due to its geographical position, we have removed the keystone in the terrorist base. Syria and Iran are now isolated, with allied troops positioned to move East, West, or South as the situation demands.
Before, the terrorists could play training camp shuffle, going from Libya to the Bekka valley, to Iraq, to Iran, to Afghanistan at will. Now, their ability to train for large scale attacks is sharply curtailed.
You may need to rethink either that or your solution to terrorism.
Something happened during the Iraq war that, although incidental to it, did exactly what you stated elsewhere: "you need to withdraw the reasoning- and propaganda-basis for them".
As a result of Saddam Hussein's threatening invasion of Saudi Arabia since the first Gulf War, the U.S. stationed military bases there as protection.
The biggest item in a Declaration of War that Osama bin Laden issued against Americans in 1998 was the presence of the U.S. military in that country.
By removing the threat from Iraq, the U.S. military in Saudi Arabia was no longer needed, they are now out of the country, and the major sticking point in that Declaration of War has also been removed.