We, as in the USA, cannot have an incessant drip of a loss of valuable funds to keep our government going. Referring to drips like money lost due to fraud, illegal immigrants stealing and defrauding, etc. Basically, the feeling of euphoria some illegals get by treating the USA as though it was great big playground to milk for money, Land of Milk and Honey, well they are acting as though milking illegally is what that must mean.

In the process of the hey, that's enough, the lines in the sand have to be drawn, there might have been some developments and incidents that turned out had some awry or unexpected elements. For example, a prospective detainee decided to attempt to flee the scene, elude law enforcement, or even physically fight against them. In the process of the melee en segue, people have gotten hurt.

It does happen, laws of physics or events that weren't in tune with expected laws of physics, may happen from time to time that have injuries in the result, especially when physical contact is involved.

Law enforcement refusing to pursue or chase, or make physical contact, no firearm equipped, and other strategies designed to minimize possibilities of injury, when attempting to apprehend criminals in the ilk of the 'worst of the worst' might not be so wise, on the scales against the obverse. One obvious reason is that criminals who kill, might kill again, and that is not something worth the risk.

FYI since 1776, date of the Declaration of Independence, and going back further in the history of policing on a global level, it has been assessed that 'fleeing the scene', i.e. of an accident, crime or from police, or 'eluding law enforcement', like speeding away from a cop after being pulled over, should be and are generally illegal. Why?, standout answer, is, those actions can lead to very dangerous situations, like car accidents, rampages, accomplices showing up and causing havoc after a certain amount of time beyond when a potential arrestee should have been secured and detained, and so forth.

Recapping, fleeing the scene, eluding law enforcement, are illegal, against US law, and punishable crimes, of course, turning on police or law enforcement and attacking them, all the more illegal, and perhaps obvious. 

Perhaps because of public fallout after a detainee got injured, such as Rodney King in LA, 3/1991, and George Floyd in Minneapolis 5/2020, combative and elusive behaviors may have gotten laxity in punitive responses being enforced.

But previous lack of enforcement, settling in as new folkways, does not not necessarily mean that the laws are not there anymore, and of course the common sense of why the laws were established in the first place.

It may be down to the fine points of the balancing act, of how much force is wise, counterbalanced with how much patience and leniency should be applied.

Again just because one guy got leniency, then 10 guys, then just about everyone in a county for the last 10 years, went without a crackdown, does not mean that one is free to go without a crackdown especially when necessary.

Of course there is the want for no one to be injured. 
Think of it this way, the risk of being sued, the amounts of money involved in a typical suit, a law enforcement agent losing his or her job over a bullet discharged when they need the money from their job to feed their family, long careers coming to a close, mourning families, families splitting up (one side cop the other the injured),agency having tarnished reputation, funding halts affecting everyone, and a whole lot more drama, is not what law enforcement agencies want.