Any Muslim can become a terrorist at anytime. When people have extreme views, that is when they become evil.
We cannot just kill all Muslims, that would be like Hitler trying to kill all Jews and taking over the world.
In the Muslim countries, they will not allow other ideologies or religions to come into their society. That is why their Islamic religion can keep brainwashing the next generations. They are not allowed to think anything else or to see other "truths" and make their own decisions of a better way of life.
Most of these people don't have a choice but to follow Islam and be Muslims because they don't have any other choice in these countries that they were born and raised. If you are not Muslim in these countries, you will be killed.
My opinion is that Islam is not good for this world, but people are still human beings and I believe that all life is precious.
No worry, in this case we can change our image to Muslim but our mind still believe in Bhuddhism, who know?. At the end our human have to deal with the reality, that is Bhuddhism. To survive we have to adjust ourself even we know that god is in our ass but not in the heaven.