Just glancing at the first of your links, it says that the evidence was just not strong enough to secure a conviction.Example? How about thousands.
In NYC alone
Charges against hundreds of NYC rioters, looters have been dropped
Sources in the DA’s offices insisted that in many cases, the evidence was not strong enough for proof beyond a reasonable doubt.nypost.com
Dozens of federal charges dropped in Portland
The Biden Administration Drops Dozens of Charges Against Violent Protesters in Portland
We recently discussed how the plea agreement with a BLM protester (who tried to cut the brake lines on a police vehicle) may indicate a significant shift from the Trump Administration in prosecutin…jonathanturley.org
More in Portland
14 violent protesters in Maricopa County have all charges dropped
Soros' appointed DA's like Kim Fox in Chicago, George Gascon in Los Angeles did worse. They failed to prosecute hundreds of rioters and looters.
This isn't surprising. These were probably mass arrests with little time for the cops to take notes. Add to that, a large number of weak cases would clog up the courts and simply grind them to a standstill.
If you read the other links, you will also note that the LESS SERIOUS CHARGES were dropped due to LIMITED SYSTEMIC RESOURCES. In other words, the justice system and DA's office simply couldn't cope with the numbers. This is not unusual in a mass demo / mass arrest situation.
What exactly are "Soros appointed DA's"? DA's in the USA are elected and many of those DA's would have been in office for several years before the BLM movement.