Robinson said he would be asking his side to take a "no excuses" attitude into the rest of the year and refused to believe it spelled the end of their premiership hopes.
"We've just got to move on," Robinson said. "There's no excuses. No one makes excuses. No one looks back in years gone past and says 'someone was out'. You've just got to move on and prepare for Manly next week."
Despite losing two of their key men, the Tricolours dominated the opening half but were unlucky to only lead 8-0 at the break.
They couldn't convert their pressure into points after they bombed it four times either when they were over the stripe or with the line open.
The 19,137-strong crowd made their feelings known when Blake Ferguson was controversially denied by the video referee when it was ruled Brendan Elliot got a fingertip to it fielding a James Maloney bomb.
Robinson also disagreed with a forward-pass call when Aidan Guerra went over in the first half.
However they finally cracked the Brisbane line in the 30th minute when they put it through the hands to cross through Elliot.
The Broncos sparked the game to life five minutes after the break when Ben Hunt and Justin Hodges found the Roosters short and sent Jordan Kahu over.
A Corey Oates try in the 61st got the Broncos back to within two and the Roosters bench was reduced to two for the final 12 minutes when Kane Evans was taken from the field for a concussion test.
While the Broncos were disciplined and took their chances when they came, they were badly outgunned by the Roosters forwards - losing the yardage battle 1773 metres to 1303.
However coach Wayne Bennett said the alarm bells weren't ringing for his team.
"It was typical finals-type football - (possession) is going to run for you and it's going to run against you. You've just got to be brave and hang in there and that's what we did," Bennett said.
"You know it's going to turn and you want to be in the contest when it turns and we were. "We're very buoyant by the fact of what we've done."
