Again, sanctions are not just "not doing trade". They are a legal framework of consequences for
doing trade that apply not just to the state doing the sanctions, but also other states, and private actors in other states who do business with the sanctioning state as well. It is not a boycott. It is a punishment with real tangible negative consequences for the target country and anyone caught in the middle.
In the US' case, sanctions often also come with things like "withholding the target country's reserves held with the US central bank", which do material harm to the target country's economy.
People keep trying to frame this as "just not buying gas/oil" but the funniest thing about that is that for the most part, the sanctioning countries are still buying gas from russia. That is literally the one thing not included in these sanctions. The sanctions would probably work better if they did stop buying natural resources, but the backsplash from doing that would be immense.
Anyways, it's awfully convenient that the tools America is uniquely positioned to use to cause harm to other countries (economic sanctions, targeted drone strikes, etc) are never "cause for war."
And again, this is completely independent of whether or not it's the right thing to do. If you can't get over your cognitive dissonance long enough to recognize that sometimes the right thing to do can cause immense harm, I don't know what to tell you. You should still recognize that sanctions are not neutral acts, and they do kill people as surely as a gun does. Thinking otherwise means you're somehow still stuck in the 19th century's idea of war (and even they would probably consider a trade blockade an act of war).