One: No armed militia is going to stop the US 7bn dollar military apparatus on home territory. Don’t bring up Vietnam. Don’t bring up Afghanistan. If you think gravy seals navy is anything compared to the Viet Cong you are deluded.
Two: using the France terrorist road vehicle attack as a counter is disingenuous use of stats/numbers. You can’t compare a singular attack to the average gun based attacks in the US. What you would do -if you really cared to compare them- is take the average per capita road rage incident or vehicle based murders and compare them to the gun related mass shootings / deaths. You can control for many factors too (time frames, region, age, etc). Something about guns being readily available makes them more likely to be used. We have millions of people driving and only so many intentional terrorist attacks using vehicles.