None at all, and in that situation sending a robot is definitely way better than sending a person.

If that was the environment they were in then short of bringing in huge ballistic shields I can't even imagine what they could have done. Maybe they don't have that kind of equipment. Maybe it doesn't exist. Maybe it exists but wouldn't have worked here. Maybe it would've worked but it was too far away and they judged the guy was too dangerous. I'm not freaking out about the PD's actions because they were probably totally reasonable, but any time the police use deadly force it's up to them to justify why that was the right call, because that's the way we make sure they only use force when it's the right thing to do.

I'm sure they will when the investigation concludes itself. This isn't me attacking the police, this is me reacting to the news that they blew him up using a robot. My reaction is, 'huh, if he was cornered and they could send a robot, why couldn't they wait him out?'. I'm sure they had a reason, I'll just be interested to hear what it was.