Propaganda of the deed? I guess suspects will be a list of people who have been paying into United Health Care insurance who thought they were covered, but got turned down, possibly for a terminal illness, for greater profits.
https://www.propublica.org/article/unitedhealth-healthcare-i...
edit: We do not know the shooters motivations, nor do I presume to know. But wanted to add a link for context to the above comment to show context for the statement.