UNSAFE ATC TECHNIQUE IN APA ATA.

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I AM BASED AT CENTENNIAL. IN GENERAL; I FIND IT IS OFTEN DANGEROUS IN THE ATA. TWR CTLRS; WHEN BUSY; TAKE LITTLE NOTICE OF SEPARATION. ON THE DAY MENTIONED; ON 2; AND I BELIEVE; MORE OCCASIONS; 2 OR MORE ACFT WERE CLRED TO AND ON THE SAME RWY. THE CTLR WAS TRYING BUT APPEARED TO BE COMPLETELY OVERLOADED AND UNABLE TO HANDLE THE SIT. A PLANE CRASHED DURING THIS TIME. I BELIEVE HE HAD BEEN CLRED TO LAND WHEN ANOTHER PLANE RECOGNIZED THE CONFLICT; VOLUNTEERED TO DO A 360; WAS AGAIN CLRED TO LAND; ANOTHER CONFLICT AROSE; THERE WAS CONFUSION AND HE CRASHED. I DON'T THINK THE CONFUSION HAD MUCH TO DO WITH THE CRASH. HOWEVER; IT CERTAINLY OCCUPIED CTLR'S TIME. A FEW MINUTES LATER A SMA WAS CLRED TO LAND ON RWY 35R. I WAS APCHING RWY 28. THE CTLR SAID SMA NOT CLRED FOR RWY 35R AND SENT HIM TO RWY 28. WE WERE BOTH CLRED FOR RWY 28. I QUESTIONED THE CONFLICT. CONFUSION FOLLOWED AND I WENT AROUND; WAS CLRED; TOO EARLY; FOR RWY 35R AND MORE CONFUSION FOLLOWED. DURING ALL THIS; VERY LITTLE EFFORT WAS PUT TO SEPARATION. THE SKIES WERE CROWDED. IT WAS VERY CONFUSING AND DANGEROUS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR WAS ADVISED OF SEPARATION STANDARDS IN A TFC PATTERN AND THAT SEE AND AVOID WAS THE PRIMARY SEPARATION. RPTR ADVISED TO CALL THE FACILITY MGR FOR A TOUR OF THE TWR AND VOICE HIS CONCERN ABOUT THE UNSAFE ATC OP AT APA.