People have trouble with the concept of partial blame, they want to feel innocent. Black and white thinking, low-resolution ethics.
It's a necessary suppression to underpin individualist ideologies, I think.
Nevertheless, remember that the 'footprint' decisions of one oil exec outweigh the decisions of thousands or millions (or billions if you include descendants) of ordinary folk. But we do also outnumber them to that extent, so we have adequate power collectively.