Factual, you've got to remember thought that there are those rare instances that justify this. There's a common trope in real life, the LAPD being one of the places that this trope is common at due to the rough and unforgiving nature of the city's southern-based crime rate, that "You never have enough backup" - Policing, when it isn't aimed at a community, is done with superior force that removes all elements of resistance from whatever it is the police are trying to do, i.e, you have a guy resisting one cop? He'll get four more to make sure that guy stops and rethinks before he tries to run off again, now that he'll have three or more tasers flying his way and not one. Its unfair, sure, but you've got to remember that with the mindset, environment and common instances where shootouts happen it is only natural for police/sheriffs... Whatever, to always make sure they've got their hand on-top and have the numerical and firepower advantage, even if its something as minor as a guy jaywalking. There's limits, obviously, but you always need to look at it from the other side too.
You're asking people to emulate real life elements 1:1 even though the real life rationality behind it has no place on Eclipse and the majority of roleplay servers. You have to remember that in real life you also have busy streets, pedestrians crossing the road, people who don't drive 100 miles per hour and are almost always stopped the moment they very much touch the curb/spin/hit another car and etcetera. Its just not possible, even though I'm sure all of us would much rather have more realism in pursuits and whatnot.
If you want the 'realistic' aspect of pursuits to shine through, you'll need a serious makeover of the entire server population's mindset, you've got people (everywhere, I'm not blaming anyone - I'm not even in any faction or group) who are more to enjoy the GTA aspect of the game and not the ideal heavy roleplay aspect of it, if you did? Then you'd have people driving off on 70 miles per hour and almost always giving up on trying after being kicked into their car's wheel because they spun out or bumped into another car. Even if the engine didn't fail and die down.
This is not a federal mandation for all law enforcement agencies in the USA, you're looking at a paper from 1990 that is not only seriously outdated but also referring specifically to a few organizations that at the time, due to various reasons (For example, Nassau County) were under direct supervision and guidance from the Department of Justice.
This is factual though. It very much is a thing in real life, and almost never done unless the vehicle poses a real and credible threat at the exact moment, i.e shooting at people.