The Center for American Progress included this eye-opening graph in a recent report.
You're not misreading that: more Americans have been shot to death in the US in the last 25 years than have been killed in battle… ever. You can read into that statistic whatever your personal politics wants you to, but one conclusion is unavoidable: that's fucked up.
To be fair, the number of soldiers killed in war refers specifically to people killed on the battlefield – the number who've died generally in war is higher (about 1.1 million according to the Department of Veterans Affairs). But at most, that lowers the WTF quotient by 4%.