Being indignant about a documented prevalence of thieves in the neighborhood was not a good reason to chase down Mr Arbery.
Mr Arbery being indignant about being chased down by a couple bubbas is a dumb reason for Mr Arbery to charge and apparently attempt to disarm one of the defendants. You attempt to grapple an armed man YOU have just initiated a gun-fight, IMO. Regardless, these defendants will likely go down on some serious charges, especially after today's testimony.
Regarding "call the cops", I don't think anyone can base their expectations on logic, reason, or preconceptions of what the response may be from the justice system anymore. Sad as it is, there is not an institution in American life that has not been politicized, no one on "either side" is going to end up liking it, and nobody's high horse will save them from it.