Menem, the president at the time, and many more made every effort to cover up who was responsible.

Only in Argentina you get such an attack with no group taking responsibility. Justice system in Argentina is corrupt as hell.

Explain that 9/11 response thing again to me please...

Yes thank god the US was able to retaliate against the countries directly involved with 9/11...

Hypothetically, imagine if it ever comes out that one of our greatest allies was involved? I wonder what the reaction will be from Americans? The craziest is thing is that nothing would happen even if it were true

Yes, but Germany isn't the US. We do believe in the "rules-based international order", meaning that there will be a strongly worded letter, some discussion in the UN security council, ending in a veto by China or Russia. Followed by years of nothing at all, a memorial and yearly speeches at some day of rememberance.

I'm not sure if this is any better.

West Germany's response to Palestinian terrorism was horrendous. But again, it's all about power. When Arabs have the most important resource in the world, you have little choice and have to submit. Lately Germany improved by much and grew some spine.