There is some reason to what you propose, and as a peace officer (and military veteran) I can see it. But you risk throwing the baby out with the bathwater by your proposals regarding SWAT teams and "military toys".
I would support some form of standardized "SWAT certification criteria", perhaps at the state level. I would also challenge judges to use the no-knock provision on search warrants very carefully. But beyond that, and more importantly...
In the event of an active shooter, be it a school, church, WalMart, wherever...for us the GSP SWAT team is at best two hours away. So we train, and are equipped for "one, two, go". We carry hard armor, and semi-auto SBR's. We train quarterly, using Simunitions, in an old abandoned elementary school. We use as many role players as we can gin up, usually around half a dozen. Quite a number of us have attended an Active Shooter Training program that also uses Simunitions and dozens of role players acting as the wounded, the panic-stricken trying to get away, those who freeze and just lay there, and the bad guys (sometimes multilple). We did multiple scenarios a day, and had to immediately repeat any scenario where either our tactics, decision-making, or aim were flawed. One of the hardest weeks of my life.
Now, who who you rather see going into the elementary school your child or grandchild attends? Me, having met a fairly high training standard and being equipped with what some might term "military toys", or a civil law enforcement officer who is neither trained nor equipped to respond to, confront, or deal with a violent, evil assault that comes out of nowhere. I know, but I had to make that point.
There's a middle ground here. I'd say you keep the German Sheperd that can eat a brick. You just keep him leashed unless you have to turn him loose, and make sure he's trained well in case you do.
The days of Mayberry RFD are gone. These are the days of the Walking Dead-From-The-Neck-Up, and unfortunately there are a lot of them out there masquerading under a variety of activist political banners. The only thing a bully understands is fear. Time to make those who bring chaos to our streets experience the same fear they are causing among people who just want to live their life and be left alone.
JMO. Rant over.