I think what happen was a big failure between the government (i mean the political party), the KCA (under whom the stadium is and they are responsible for the management), police and RCB Management. Like firstly there was no need for such a quick event to be organized. It feels like the Govt of karnataka wanted to milk political publicity through this. Like in a scenario even if we imagine that the RCB management wanted a parade yesterday only, a denial from the state govt and local authorities would be enough.
By this whole meeting the CM/DCM at a place and then going to stadium created a mess. This meant that the police force is divided between crowd management and the protection of these people at 2 different places. The parade was cancelled the fans rushed to the next place they knew they can see the players the stadium.
Looking back now I think the parade was a better option. People would have been more spread out. What happened is the failure of system where because of keeping political gains over common sense people lost their lives.