If that were true statistically speaking you'd see a lot more post-war violence, after vietnam war, Iraq war, ...
In truth, the bereaved will surely be angry at the bombs dropped by party X, but at the same time understand the impatience of party X towards government Y that oppressed both you and your dead family.
There is much more room for regret: regret of not openly supporting saner voices, regret of taking what seemed to be the least personally risky path, until the final conclusion proved otherwise...
Allowing your government to rot to the core and pretending citizens do not carry any responsibility is what leads to things like Nazi germany, Iran, etc...
You are definitely seeing a lot more post-war violence after the American-induced wars of Iraq, Syria, Libya, Afghanistan, Yemen, Lebanon, etc. You can check the statistics yourself - there IS a structural increase in conflicts. The world is seeing more simultaneous conflicts than in decades. Most of which can be laid at feet of U.S. & Israel.
The War against Iran is the most stupid conflict I have seen instigated by the U.S. Your quote of "regret of not openly supporting saner voices" should be directed at the U.S. & Israel since they launched this war. There was no cause for it except for distracting from the Epstein files and any blackmail material held by Israel.