Do you think this verdict will change police behavior?
Yes, but this is the proverbial tanker that can't turn or stop on a dime. Change will take years. But it may be less that the conviction changes behaviors as much as the fear of being recorded that is the catalyst.
Do you think this will embolden criminal behavior?
I dont believe it will embolden criminal behaviour but it will embolden criminals to not comply with police instruction, which invites more problems.
Do you think there will be a revamp of North American training standards for police?
Yes, but the problems are much deeper than simply training, especially in the US. It's the mentality of those who work in policing, the militarization of police and the stress of the job, plus the expectation of the Blue Wall and the power of police unions, protecting the bad cops.
Why didn't the other attending officers at the scene of this murder get charged with accessory???
They are facing charges but I doubt it will be anything too severe. If I am not mistaken, Chauvin was the most senior so they would have likely not challenged him and with a group of angry citizens screaming at Chauvin, they may have been more concerned with preventing a riot. I am not defending them at all (they should be held responsible too) but I can see where they were put in a tough spot by Chauvin's actions.
I think it is in Malcolm Gladwells book Outliers where he writes about co-pilots who would not challenge senior captains even though they knew the captain was making a terrible mistake that ultimately led to plane crashes. I don't think this bowing to a senior officer can be entirely dismissed.