This is a mischaracterization of what actually happens in the us. Using sensationalism doesn't help, instead let's focus on the actual numbers and be constructive on how to decrease them.
In 2023 it's estimated police killed around 1,248 people. Notice I said killed vs Murdered as words matter. Out of that only 104 were unarmed. Now without looking at each case or example here, you can still account for the mass majority of police interactions ending in a death, the civilian was armed at a minimum.
Using the data provided we could say easily that 1,248 people is way too many. Hell, 1 is too many. That doesn't change reality though, if 1,248 deaths were related to individuals engaging in crime, this is a causality that you can lay solely on the civilian victim, as they chose to engage in this action.
We can argue how many were crimes, that's fair and i'm happy to throw out and say let's assume 25% were not crimes and really were just an escalated interaction. The bureau of justice statistics gave numbers for 2022 that estimated that 49.2 million people or 19% of the US had an interaction with the police. If that's true, napkin math would put the police murders at .0025% of the interactions, and assuming 333,287,557 million people in 2022 (census bureau) places it at .00037% of the population died by the hands of police.
Some related statistic. Roughly 500 people die from falling out of bed or off furniture, 300-400 die from drowning in a bath tub, 4,000 die from choking on food, 150 die from coconuts falling on their head, 500-600 die from falling from a ladder.
Looking at the numbers, it's very hard to say that police "Regularly murder people".
As for the "Everyone having guns" that's a separate debate, but I would posit you're correct with regard to criminals performing criminal acts, that are armed, increase the likelihood of a negative out come. Federal arrests for weapons offenses were around 8,000 with states being at close to 12,000. Putting that at 20,000 or so arrests per year. Even with those numbers if you're arrested with a firearm, you're still at around 6% chance of death. Again given the circumstances and propensity for needless escalation, these numbers while bad aren't crazy.
There are multiple problems in the US. We need better training and funding for police departments, we do need to weed out the bad cops (as with any field), but with all that the most common denominator is criminal behavior.
All of that said, If you've got data points or information that may be counter to the above, i'd be very curious to see it. I'm very much open to having my mind changed on the topic and encourage you to post it up for all of us here.