Of course 92% of killings were "extreme Islamic related" if you count the total number of US deaths across a period that includes the World Trade Center attack, as your link does. That one attack alone accounts for over 89% of the terrorism-related deaths in that period. Cato acknowledges that, but still goes on to present "chance of being killed in a terrorist attack sorted by ideology" in a manner which ignores that 9 out of 10 of the deaths occurred in that one outsized attack. If we presented this same information asthe number of terrorist attacks on US soil that resulted in any deaths -- which is arguably more relevant if we're trying to present the likelihood of being caught in any fatal terrorist attack -- then white nationalist attacks would be far and away the ones to worry about in the US.