Keep on like the irrational, name-calling paranoiac you (apparently) are.
There is no evidence of any rounds being fired on innocent people. No rounds were fired on anyone, as they were all blanks, and the video shows nothing about who or what, if anything, was targeted. There is no reason to believe any civilian was ever endangered in any way.
I could envision all kinds of logical justifications for this, most obviously an anti-terrorism drill. Obviously if the government just announced why they were doing this to make you more comfortable, it could undermine the benefit of the drill, depending on its nature, because if it is, for example, an anti-terrorism drill, terrorists would learn the nature of the way the military and LEO are training and drilling. I don't personally find the drill anything scary, as I am a military veteran and have been involved in numerous real-world and drill deployment situations, and it doesn't strike me as something that requires justification.
Since you're the one who's so incensed about this, what exactly is your concern?
To be fair, it doesn't matter if they were blanks and if they had the catchers for expended cartridges so that no brass rained down. The very fact that weaponry was fired, in any shape or form, outside of a specified training range, is a major issue.
I personally don't care that much, and I don't fear it in any way - but as someone who has to actually commit to such planning and training (not of this specific nature - but in general), I know the bureaucratic and political-type gauntlet that these kinds of decisions are subjected too.
The fact that this even went ahead at all means it had to have been fairly high up the chain of command, at least regionally. A lot of approving stamps - but enough details may have also not been identified so those approving commanders didn't know THIS would happen.
Regardless - the best that will happen (for those who it will happen to) is people will receive some very negative annual ratings. Depending on the rank of each officer involved, even that best outcome is basically a "get the fuck out - we're done with you. no pink slip, but never getting a promotion either."
(Up or Out mindset, at least in the Army). People will likely lose their posts, get transferred, etc.
In short, there will be drastic repercussions, as there should be. This should never have happened, for various reasons.