you can't be "against terrorism." There's no such thing as pro-anti terrorism - just like pro/anti-crime. Terrorism happens because of opposing group's inability to voice their concerns in a constructive way so they resorted to act of terrorism.
Remember - terrorism is created, not born. We created terrorism because of the nature of our business. We got involved in foreign country's matter and started dictating our terms on them. Therefore - the terrorism (or commonly called as "Freedom Fighters") was created to resist the invaders.
Al-Qaeda was created to preserve the traditional Islamic way and defend the Islamic countries from invaders such as America and Russia. As long as we keep violating their cultures and countries, Al-Qaeda will continue to attack us anywhere, anytime.
Get it? you want to end terrorism? leave them alone and stop exploiting them. Most of our wars on foreign nations are largely for economic interests. We fight to secure our resources - whatever it takes.