The allegation is the reported fact. The removal of Dustin from the restaurant is reported fact. His friends or others shouting "Dustin! Dustin! Leave it!" is reported fact (seen on video).
The police could have decided that it amounted to a public argument, which is not a crime. Without the lady's statement - she declined because she didn't want to go through the court case etc - they couldn't ever say more than that as they don't have any officially reported context of how she felt at the time. But we have what she said on TV, so we can make a pretty good guess that something nasty happened.
If nothing happened - why was he kicked out? Why were people getting him away from the lady?
Nothing is proven to have happened or not to have happened. It is not proven that she lied.
But we can see the bits and pieces that came out and work out that it wasn't just a pleasant exchange of views.
Bottom line, the police investigated the incident. her statement was public record in what happened and the police investigated what she claimed and found that no criminal action took place. That to me has more weight based on a alleged threat that nobody, not one witness, step forward and said they heard it....i wonder why ?
Seriously, if joe public at the table heard and saw Dusty do what she stated, they would have taken there 15 minutes of fame, but nobody came forward backing her version of events. What happened when interviewed by the police, they obviously stated what they knew to have happened and the police decided Dusty had no case to answer.
The police statement was pretty clear. They did not state, that due to her not giving a official statement, they could not prosecute Dusty. Simply she did not make an official complaint to the police to protect herself from any further action. Again, your last statement is where I disagree, you are happy to assume/guess Dusty did something "nasty" because of what she stated on TV.
As to Dusty's friends saying Leave it as whats on the video, its simply Dusty's mates trying to remove him from a situation that he just could not win.
Its a sad world where we "believe/guess" the truth because someone said something on TV.