But you are justifying their wrong by pointing out other wrongs. So yes, you are in effect justifying their violence.
I don't think it's "wrong" for individuals to do terrible things in war .... against enemy combatants. There are grey lines. Firebombing Dresden in WWII. the A-bombs. That's not to make moral judgements, but rather to say I won't judge other's beliefs on the specific actions. However, there's no comparison between burning a prisoner in a cage, and using a flame thrower to destroy a bunker containing people shooting at, and trying to kill, you.
"Obama's Pentagon Covered Up War Crimes in Afghanistan, Says Amnesty International
The human-rights group reports the U.S. military systematically ignored evidence of torture and unlawful killings in Afghanistan as recently as last year.
The U.S. military has systematically covered up or disregarded “abundant and compelling evidence” of war crimes, torture, and unlawful killings in Afghanistan as recently as last year, according to a report by Amnesty International published today in Kabul."
Obama s Pentagon Covered Up War Crimes in Afghanistan Says Amnesty International - The Daily Beast
" “US Practiced Torture after 9/11, Nonpartisan Review Concludes” (Apr. 16, 2013)
• “Afghans Say an American Tortured Civilians” (May 13, 2013)
• “CIA Drones Kill Civilians in Pakistan” (Mar. 18, 2011)
• “GI Kills 16 Afghans, Including 9 Children, in Attacks on Homes” (Mar. 12, 2012)
• “Libya Effort is Called Violation of War Act” (May 26, 2011)
• “NATO and Afghan forces killed 310 civilians over the same period, mostly from airstrikes, the UN reports” (Aug. 3, 2009)
• “100,000 Iraqis killed since U.S. invasion analysis says” (Oct. 29, 2004)
• “U.N. Chief Ignites Firestorm by Calling Iraq War ‘Illegal’” (Sep. 17, 2004);
• “Iraq Says Blast in Baghdad Kills Dozens of Civilians: U.S. Blamed” (Mar. 29, 2003)
• “U.S. Presses for Total Exemption from War Crimes Court” (Oct. 9, 2002)
• “Pentagon Says U.S. Airstrike Killed Women and Children” (Mar. 13, 2002)
• “Bombing Necessary Despite Toll on Civilians, U.S. Envoy Says” (Jan. 9, 2002);
• “U.S. helicopters fire on women, children in Somalia” (Sep. 10, 1993)
• “US forces buried enemy forces alive” (Sep. 13, 1991)
• “200,000 died in Gulf War, and counting” (May 30, 1991)"
Double Standards for US War Crimes Consortiumnews
How about instead of trying to depict our enemies as the bad guys, and us as the good guys we begin depicting wars as the bad guy, and peace as the good guy?