In a robust exchange with the media, Beattie admitted that the sudden and drastic change to the way the NRL deals with players charged with serious crimes might be viewed as policy on the run but he said the Commission's hand was forced when it became clear that the previous policy was failing to protect the game's image.
"And that is what we have done in this (de Belin) case".
"This is not about being popular, this is about doing the right thing by rugby league".
St. George Illawarra forward Jack de Belin, who has pleaded not guilty to a sexual assault charge, became the first player sidelined under the new "no fault stand down" policy, the governing Australian Rugby League Commission said on Thursday.
Beattie said serious offences would be deemed anything with a maximum penalty of 11 years in prison or above.
The policy change has been strenuously opposed by the Rugby League Players Association which says it will prejudice the players' right to a fair trial.
NRL chief executive Todd Greenberg also outline his ability to stand down players following any alleged charges involving the assault of women and/or children.
Jack De Belin (middle) has been charged with aggravated sexual assault but has pleaded not guilty.
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ARLC chairman Peter Beattie made the announcement in Sydney today, saying the NRL had ended up "with a tsunami" of off-field incidents and that the old policy wasn't working. It also could result in players who are found not guilty suing the NRL for damages to their career.
"We understand and support the Commission's desire to improve the standards of player behaviour and propagate the game", said Dragons CEO Brian Johnston.
"Duty of care has always been a priority for us and we have great concern for Jack's welfare".
"If we were to shift the policy and stand a player down, we're in unsafe territory", said Rugby League Players Association chief executive Ian Prendergast ahead of the decision.
"We're about to head off now and give consideration to the changes the NRL are making to the rules so we can digest that".
"We don't believe you make decisions based on an amount of issues that have occurred in a short period of time", said Prendergast, "because whilst trying to solve one problem you can create others in the future around how a policy of this nature will be applied in practice".
The Dragons said they would consider the changes made by the game's decision makers and they were concerned for De Belin's welfare.
A player that is stood down will still be able to train with the club - although no automatic salary cap relief will be given to the club.