yes fair enough, this is a strong argument.
the consequences for Europe may be bearable for the moment but I suspect will have long lasting manifestations down the line which might shift the calculus, as economic pain is felt by the people, who will shift the politics of every country to the right. Italy will be the first, Scholz will be the last Chancellor of the SPD, Macron will give away to the right when his term ends.
all this may still be 'worth it', tho at some point enough people in European democracies might disagree. Their answer might be quite unpalatable
Sanctions are hard for Europe and there's a growing argument, in Europe, that they only benefit the US without being effective, and that they should be abandoned.
As a European, I think this line of reasoning is extremely wrong, defeatist and careless.
Sanctions are necessary even if they don't work, because of the message they send. But if they do work, so much the better.