1. I notice you haven't denied Tony's responsible for going behind the other Avengers' backs, playing mad scientist with an Infinity Stone, creating Ultron and barely putting any failsafes in place (e.g. not going off to a party and leaving things up set up so that the new AI had access to Jarvis, the Iron Legion and the internet).
2.Tony is partially responsible for extremis. He had a one night stand with Maya Hansen, saw that she was playing around with genetic engineering that led the subject to explode, gave her an improved formula (that later made it possible to weaponise it) and then snuck out of her bedroom and lost track of the incredibly dangerous technology he'd helped enable.
3. It's not just about the weapons Stane gave to the Ten Rings though. The guy spent decades building deadlier and deadlier weapons and earned the nickname the Merchant of Death. Arms dealing's an inherently shady business that contributes to a deadlier world and if the MCU is anything like the real world then Stark weapons would've been used by the US in Afghanistan/Iraq with collateral damage to civilian populations. Stark missiles were also used in the Sokovia Civil War - killing Scarlet Witch's parents - and Tony never denies responsibility for it.
You're blaming the victim here. Loki went mad when he learned he was adopted and tried to have Thor killed. That's on Loki and Thor had no way of predicting it.
And then when Thor - just a human at the time - saw the Destroyer was wrecking the town and endangering innocents he walked right up to the Asgardian death machine and tried to sacrifice himself.
He admits to Ultron. That's the only thing that he's done wrong.
Again, you're reaching, Extremis was created by Maya Henson, Killian and AIM. Tony gave her a formula to reduce the volality of it. He never weaponized it or made those soldiers into literal human bombs.
Yeah, the bad guys call him the merchant of death, the weapons were meant for the bad guys. The country was at war. Whatever wrong he's done, he attained for it. He stopped making weapons and started helping.
You can't say Thor has no way of predictions the consequences of his actions and try to act like Tony did.
same with Scarlett Witch, how many people, fathers, mothers, sons, did she kill when she blew up that building? Oh but let's keep bringing up Sokovia when she was a kid, which had absolutely nothing to with Tony.
Typical fanboy comments, it's ok when the popular characters cause death and destruction (Thor, Scarlett Witch). But let's demonize Iron Man every chance we get.
And, LOL, Thor is no victim here. He and his arrogance attacked the Frost Giants, and he got banished to Earth and brought the destruction with him. Had he never gotten banished here, the town would never had gotten leveled.