Edit January 19: FLI has made a substantive statement about this issue:
https://futureoflife.org/rejection_statement/
This seems concerning. It is claimed that the Future of Life Institute, run by MIT professor Max Tegmark, offered but did not pay out a grant to a Swedish far-right foundation. The character of this foundation and its associates is well-known in Sweden. Expo is an old and respected watchdog organization specialized on neo-nazism and related movements.
https://expo.se/2023/01/elon-musk-funded-nonprofit-run-mit-professor-offered-finance-swedish-pro-nazi-group
This statement doesn’t disavow the idea of funding neo-Nazism, and the lacuna is worrying: by convention (pragmatics), omitting to comment on the salient thing is taken as a comment in itself. Have you sought advice from communications specalists? If not, it would be well worth it to avoid unnecessary misinterpretation, if you want to disavow the main allegation.
Here are the main bits that stood out to me as suboptimal communication.
I would like to understand why you decided to reject the grant proposal after doing due diligence. Was it because of their far-right politics, or a conflict of interest, reputational hazard, or something else?
I wish you would not imply your critics are politically narrow-minded for being worried FLI is alleged to have considered supporting a neo-Nazi outlet. I would like to understand if there are any limits here - are there any political views you are not willing to support?