As an owner Roman was as good as it got. He loved the club from top to bottom so I can understand why the fans there love him, if you can't, it's purely due to football.
Most of the American owners in the Premier League have donated large sums to governments responsible for war crimes. Saudi Arabia is responsible for a humanitarian disaster in Yemen, and City's owners are guilty of numerous breaches of human rights, particularly towards the LGBT community and slave labour. All their fans are aware the success they may have is partially down to them but continue to support the team and in Newcastles case, actively glorify their owners.
Most really rich people are scumbags.