It's really neither here nor there about feelings, whether one is threatened or not by another person's life choices. It doesn't even matter what any of our opinions are regarding it. The mentality that breeds terrorists is
trusting in the flesh, and not trusting the truth of God, not loving one another, not showing Christ's love toward even our enemies.
People fighting, arguing, debating angrily, disregarding one another, envious of others, seething against each other, humiliating one another, trying to make others jealous, despising others, looking for opportunities to make a jab at someone, hating people because of varying beliefs. It's all pride, all fleshly. That's what causes wars.
James 3:16 For where envying and strife is, there is confusion and every evil work.