I have wondered. I mean, If I had blown up a building full of men, women, and children, and got pulled over by a cop while driving with no license plates, with a 9mm loaded in reach, a highway patrollman just might end their career on the spot. What is one more? Drive away and ditch the vehicle.
It is as if McVeigh wanted to be caught. Maybe he figured he'd walk, not take the fall.
The only thing, I can think of that would involve National Security would be if the missing information proved that the government incorrectly tried, convicted, & executed an innocent man or that the government was actually involved in the killing of the Citizens there. That is, if the Government did something that would cause a loss of face or, undermine the legitimacy of its authority; for it is this authority which would become null & void should the government be killing its Citizens.
The Clinton administration made political hay out of the idea that a "right winged radical" murdered over a hundred people, allegedly in retribution for Waco.
The Waco massacre was due to be investigated in congressional hearings, gunowners were gaining momentum fighting the assault weapons ban, and progress was being made in the Randy Weaver/Ruby Ridge case as well.
The shift in public sentiment that came with the attribution of the OK City bombing to what has become the cliche carriacture of 'right winged, Constitution quoting, radical gun nuts (who love Jesus)', took a lot of the wind out of the sails of the anti-Clinton, anti-DOJ under Janet Reno outcry, and did, in the public psyche, more than counterbalence the horrors which the government had committed in Texas, Idaho, and elsewhere.
With the WTC Bombing in '93, and other terrorist events which had been attributed to foreign (islamic) terrorists, and leaking information that the WTC Bombing may have been a blown sting operation (iirc, the on board informant showed them how to make the explosive), the Clintons had everything to gain by denying foreign involvement and blaming factions on the Right.
Probably did not know his plates were removed. Officer asked him to step outside the car and that separated McVeigh from his weapon. But who knows, the feds apparently just helped a terrorist in Dallas get a vehicle and fake explosives. All that was lacking there was someone swapping real explosives for the fake ones some where along the line. What we know for certain is that we will never hear truth from the Feds. And anyone who speaks truth (Wilson on Obama, Bolton on Iran) is admonished.
Indeed, what you say is true. And it certainly is suspicious that McVeigh’s execution came so swiftly; especially in a system wherein murderers and rapists on death-row are given DECADES for appeals to go through.