There were emotional scenes in a NSW court as a bus driver pleaded guilty to causing a horrific crash that killed 10 people and injured 25 others. Brett Button had been ferrying wedding guests in the Hunter Valley in June last year when he lost control of the coach at a roundabout. Some of the victims’ families became distressed and others later said they were “disgusted” at the prosecution’s decision to drop manslaughter charges and accept Button’s guilty plea to 10 charges of dangerous driving causing death and 25 lesser driving offences. Reports say court documents detail the driver’s long addiction to pain medications after a workplace injury in the 1990s. His lawyer asked the court to take Button’s “diagnosis of depression, anxiety, and other things” into account while he remains behind bars ahead of sentencing. The deadly crash was Australia’s worst in nearly 30 years…