Point by point:
1 ) The violation of fundamental human rights was certain (it was part of the Nazi ideology), grave (genocide and murder of all who voice opposition to Nazi policies and belief), and prolonged (it had been nearly a decade of such abuse).
2 ) All dissention was met with the murder of not only the dissenter, but often that of his family as well. At the bare minimum torture and death threats were used. After the Nazis seized total power in the 30s there was no longer any other means for redress besides out-and-out war, as can be seen by World War II itself.
3 ) The resistance
couldn’t provoke worse disorders; they were already at their absolute worst. Organized genocide and oppression of almost all basic human rights was the day-to-day policy of the Nazi power. Total societal collapse would actually have been a step up from that state, since people would once again have the ability to freely organize, and systematic genocide would be impossible.
4 ) The German resistance as led by these particular men was not a rag-tag group, but actually had a
military protocol to implement in the event of Nazi collapse (a protocol approved and signed by Hitler, no less, though obviously he didn’t know how it would be utilized). All they had to do, so they believed (and with good reason, since it was the official, above-the-board military standing policy), was make the call that Hitler was dead, and the military would move to seize power. They had the support of top generals to do so, assuming the death of Hitler; unfortunately he survived the attack and the Valkyrie protocol could not be properly enacted (though the resistance still tried to push the generals to act, and some did in fact move their troops for the take-over).
5 ) The only “better solution” was a prolonged war with many more innocents being killed. They didn’t know how much longer the war would last and the Nazis would maintain control, but at best estimate it would still be a year or more. In that time potentially millions more would be killed, not only in battle but in the concentration camps (and this makes these men even more noble, IMO, since they cited the ongoing genocide as one of the major reasons for acting; it wasn’t just a fear that Germany would lose the war dishonorably under Nazi rule). That would be the “best case scenario” if they didn’t act, and that best case scenario was not better than the one they had set up.
So based on these elements I’d say that the German resistance was a perfect example of the legitimate right of the people to violently combat an illegitimate government. Again, it wasn’t just a “Hitler’s bad, let’s kill him” attack, it was a “we are making war against the illegitimate Nazi party, and step one of the uprising is a direct assault on Hitler so we can enact the Valkyrie protocol and arrest the other Nazis”).
If it was just about murdering Hitler there would be more questions, but it’s pretty clear that he was essentially a military target as part of a much, much larger plan of resistance.
Peace and God bless!