Treating culture as uniformly distributed and absolute is racism. Your racism is blinding you to truths, leading you to illogical conclusions like the idea that it's possible to make an accurate assessment of military threat based on "culture." Hence why I called it caveman logic - you're literally defining your level of fear of another group of humans based on how different you (erroneously) perceive them to be.
You seem quite concerned with the plight of the Palestinians so I'll use that as an example: Jewish people experienced the worst, most widescale crime against humans ever committed, and then a few decades later, a subset of Jewish people turned around and began doing the same (at a smaller, less industrialized scale). This demonstrates the perfect universality and programmability of a human, which includes "human culture."
Any human culture can be molded to justify any existent human action. To pretend otherwise is to engage in ethnocentrism - what you accused me off, the presumption that there's something special about your culture that prevents atrocities happening under it.
The second that makes your argument racist rather than logical (if you refuse to budge on the word "racist," swap in "prejudice" - the fallacies are the same either way) is the homogeneous angle you're applying. This should be an obviously fallacious statement: "Christianity is a violent culture that supports violence against Jewish people, discrimination against gay people, and school shootings." Why is it fallacious, though? I know lots of christians that have done all of the above, proudly tying it back to their religion. You see my point, right? You would, presumably, never walk into a room of white people and assume they all share identical values - do it in America, half probably are tearing their hair out in frustration at the values of the other half. Yet you do it to Islam / Arabs / Muslims, because, frankly, you are racist against Muslim people.
An argument that depends on making a blanket statement about a group of people fails for many reasons: categorization (how do you accurately and scientifically select who falls into this grouping and who doesn't?), resolution (how do you account for outliers within this grouping, and how do you determine who might be an outlier?), absolutism (how do you account for the fact that people change?), and due to above, how could you justify making any decisions based on a prejudiced framing?
Racist arguments are completely dependant on fallacy. With a rigid application of rational reasoning, they fall apart. They're illogical.