"Drunks in A&E"

I have over the period of a week twice been taken to A&E and been in the examination room having blood taken when a drunk patient caused a disturbance. in the first instance the drunk became aggressive toward the staff and fell heavily on top of a very frail elderly lady lying on a trolley .she was very distressed and I believe an injury she had made worse. the next incident on15 /08/ 2019 in the same examination room was another drunk who became violent and threatening toward staff fell over several times causing alarm to patients. he eventually walked out obviously drunk and aggressive. He seemingly fell into the bushes outside A&E and brought back in slightly more sober. I admired the restraint and behaviour of the staff in both instances but cannot understand why an obvious drunken aggressive person is ever allowed In an examination room where other patients some very ill and fragile.