I think he was painting with a little bit of a broad brush. Saving Private Ryan doesn't trash the military, and I can't think of any Spielberg movies offhand, that do. I haven't seen Munich, but if Spielberg is so convinced that the Mossad and the terrorists in Munich are morally equivalent, maybe he should go spend some time with each. Oh, that's right. Hamas would kill him simply for being Jewish. Guess he should schedule the meeting with the Mossad first. In Schindler's List, he played fast and loose with the facts. Schindler sneaked weapons into the Jews, and they were better armed and outnumbered the guards that were supposed to kill them. He also left out a significant fact about the "Night of Broken Glass." While it's true that this marked the beginning of the actual rounding up of the Jews, it was also a test run. The Nazis thought the Jews had to know what was planned for them, and that they had planned an armed resistance. The Nazis expected the Jews to have stockpiles of weapons, and for rounding them up to be a difficult military operation, involving door to door fighting and significant losses. When, on the "Night of Broken Glass", they found nothing but a couple of rusty revolvers and rifles, none of which were used, they began the sweep in earnest. Spielberg left these points out because they didn't fit in with his personal vision of an unarmed citizenry is a safe citizenry. Why do Jews in Israel carry weapons? After the Holocaust, their mantra was, "Never again." What they meant was that they would never again be led like lambs to slaughter because they couldn't defend themselves.
Also, though, even movies that don't trash the military are a little hard to watch, sometimes. Blackhawk Down is very difficult for me to watch, although I think it's a brilliant movie. The concept of Hollywood trashing our military, I think, really goes back to the eighties and MASH. MASH was kind of the template. Everyone who was patriotic was a moron or a flake. Hawkeye made his famous speech about how we were fighting for the Koreans right to have a heart attack while planning to stab their boss in the back. Fop painted with a broad brush, but his overall criticism is valid.
I admit I didn't see it, but I've read mixed things about it. Some said that it didn't trash the soldiers, but it trashed the military leaders.
Either way, Spielberg's a wet noodle.