Ronnie O'Sullivan has been backed by John Higgins
O'Sullivan hit out at Hearn earlier this week and claims to have been "bullied" by the World Snooker boss.
The 68-year-old promoter has refuted the claims but Higgins has revealed that he believes the snooker boss should rethink his treatment of O'Sullivan.
“I have a degree of sympathy for him,” Higgins told BBC Radio Five Live.
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“If I am led to believe what I have heard about how he was reprimanded, it is out of order.
“He has a lot to take on his shoulders in this sport because he is the biggest name – along with Ding [Junhui], the biggest name in the Far East.
"The game would be a lot poorer without him.”
Ronnie O'Sullivan will face Shaun Murphy in the second round of the World Snooker Championship
Higgins beat Martin Gould in the first round of the World Snooker Championship in Sheffield today, overcoming a slow start to triumph 10 frames to six.
O'Sullivan meanwhile booked his spot in round two on Sunday with a 10-7 win over Gary Wilson.
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However, he let rip afterwards in response to a disciplinary letter he was sent in January which he felt used "threatening" language.
"I don't think I've done a lot wrong," O'Sullivan said on Sunday.
"A friend told me to let the lawyers deal with it.
"I won't get involved anymore because I am not being bullied."
And Higgins believes the players need to show more unity in the face of World Snooker.
“There are things in the players’ contracts that are too severe but the only way we can change that is if all the top players got together and stood together, tried to get things taken out,” Higgins added.
“But I don’t think every top player is going to stand together.”