People will think all kinds of things and there are many people with different ideas. Not everyone can be right all the time. It often comes down to how you were taught, what kind of media you consume, whether you seek the truth and logic or prefer emotion, and what your emotions lean toward. All I can say is from a purely logical perspective, Iran is not on the right side of this, even if it is fair to say that Israel has been extreme in its own way in reacting to aggression.
This isn't only about Israel. Iran has rubbed all of its neighbors wrong for 40+ years. If this was only about Israel and no other country, then there would be more to dig into there, but it is more than that.
At least we are free to express our ideas in the US and Israel. In Iran, they do not have free speech. The government can and will punish you for speaking against the government. They can make anything seem true just by imprisoning anyone who says otherwise.