You think the death toll of the US government is below 500,000? I have some most unfortunate news for you...
The US government killed over 250,000 civilians in Hiroshima and Nagasaki, and remains the only government to ever deploy atomic weapons in combat, to say nothing of knowingly and intentionally deploying it against civilians.
The US is responsible for a substantial portion, though not outright majority, of the >1.5 million civilian deaths on the Northern side during the Korean War.
The US government killed over 180,000 civilians in Vietnam - miraculously few considering they dropped over 7 million tons (14 BILLION lbs) of ordnance on a force of only 860,000 troops occupying less than 110,000 km². For reference, that's about 63.5 tons / 127,000 lbs of high explosives per square kilometer of the entirety of Northern Vietnam. That's also over 8 tons / 16,000 pounds of high explosive per combatant.
These represent just the civilian deaths of just 3 of the 123 military conflicts that resulted in at least 1 civilian fatality (5 ongoing) that the US has been involved in - a microcosm of the all deaths that have ever been inflicted by the US government.
Remember, not all military combatants voluntarity chose to fight. Think about how many Russian and Ukranian men have been conscripted against their will (at gunpoint), never killed another person, and were killed in a war they didn't even want to be fighting, left with no alternative choice. Are those men's deaths morally justified simply because they were in uniform, or is it possible many of those, too, were innocent, good people forced to participate in an ugly tradition?
If you add even 10% of combat fatalities inflicted by the US government, that figure exceeds the combined total of all documented drug overdose deaths in American history, though it's worth noting that records on that don't go back very far, as the war on drugs that has destroyed millions of lives is a very, very recent thing in American history - it started less than 60 years ago as a plan to weaponize government against political opponents (anti-war activists who care more about preserving human life than about enforcing American political will around the globe).
Read a history book or two, you might learn something that your government-funded schools conveniently skipped over.