My understand of the defund police campaign is to relegate away duties that should not have be in the domain of law-enforcement and hand them off to better trained agencies. Things like handling of mentally ill, homeless and domestic issues. Lately, officers are being called in to handle minor issues at school which at worst used to be punished using detention. Police being involved in incidents like these very obviously lead to escalation.
Other than that, the blue lines, aggressive police training and hardware is a serious problem and needs to be dealt with. Militarizing the police and disproportionately targeting certain races leads to the reaction you now see on the ground.
which I understand, but here is where the problems lands at, BLM started this racism just like some of the departments have done, which many Departments are still under reform. for example, Houston Police handled their city better than others, but still BLM claims to fight racism by encouraging racism. BLM was originally approved of, since they did want to fight racism the legitimate way, however this movement of BLM (backed up by Antifa) is worst than one possibly can imagine, and cities and corporations are bowing to them just for cheap political points (some BLM have said before this whole stunt is to make Trump lose office)
the problem with homelessness that needs to be dealt with quickly, isn't the fact they are homeless it's the laws they are breaking.
for example in San Francisco, Seattle and Portland Homeless people are able to poop in public anywhere without any repercussion (those cities claim it's "progressive" lol), then you also have the Needle Injection safety zones (those same cities) which more people have been "stuck" by needles on the ground than previously but again it's considered "progressive"
as for the militarization of law enforcement, it depends how you want to view the said outcome. they don't need MRAPs or Humvees for every little thing, but at the same time, in the US you have a society who thinks "I can break law and no repercussion" will happen because most Liberal Judges and so on don't have a spine to punish said kids/adults. and parents in the country are told if they punish kids by legitimate discipline the child services will take their child away + parents go to jail
you also have bail reforms happening in cities such as LA, Seattle, Portland, Houston, NYC and others and the mayors/governors etc. are like I don't know why we had a spike in crime
but I know there is several departments that have both kept their police budgets + looking to spend millions into neighborhoods riddled with crime without removing any other budget. Chicago is an example of this, Mayor said she wouldn't defund CPD however she'd allocate more funding to clean up neighborhoods with crime.
the situation, itself isn't a nationwide thing IMO, it depends where you live and how the city/county/state wants to handle the issue. for example LAPD, has always had a long history of abusive power, such as the LAPD CRASH unit. but you also had Oakland who had a corrupted Police Chief who didn't care for his community at all, in fact used his authority to gain cash in order to protect communities, which a major reform happened, and went from 2,000 officers to 800 (that happened from the 1990s) and the list goes on.