No, the point is that within any large group of humans, you are always going to find some small number of violent psychos. That small number is not a reasonable basis on which to judge or characterize the whole group.
But at some point, when the numbers do become significant and the amount of violence goes beyond the normally expected number of deviant psychos in a given group, you can draw conclusions about the group as a whole.
If the amount of violence committed by self-proclaimed Muslims was anywhere near the really small number of violent incidents committed by Christians, your concern would be justified.
But given that the violence against "infidels" committed by followers of Islam is so predictably widespread -- particularly in areas where their numbers approach a majority of the population -- the refusal to acknowledge and recognize it as a core characteristic of Islam is willful blindness, and (with all due respect) intellectual cowardice in terms of unwillingness to name and understand the enemy of civilization.
It is this blindness that has cost us the impending collapse of the greatest, most productive and most humane country in the world.
Hmmmmm.