The Pentagon’s new ray gun!, page 1

First Off,

95GHz is millimeter, not micro wave. This implies a lot of things including phenomenology attributes often more similar to IR than RF. You can jam RF. You can block it with metallic-smoke and some kinds of chaff.

In terms of 'police' (Law Enforcement) vs. military use, you are indeed sliding down a very slippery slope however.

1. Because of Weapon Mechanics issues.
Disabling a tank (which easily gets above 140` in Iraq anyway) with heat is pointless, not least because of the lack of water in Chobham to accelerate the process of 'energizing' such a dense mass.
2. Because of Psychologic Intimidation Factors.
'Crowd Control' is what happens when WTO protestors in Seattle are subjected to gas and chemical spray because one man busted out a window in a coffee bar. Decent policing would have people in the crowd able to take down the violator while covering each other. It's called one riot one ranger and it is the difference between forcing PEOPLE to acknowledge the difference between right and wrong. And succumbing to the mob psychology yourself in 'fearing the herde more than the feral bull'. In particular, WHAT HAPPENS when that 'one man' is in fact an agent-provocateur FOR THE GOVERNMENT?
Now you have just crossed the line between law enforcement and Orwellian social disenfranchisement with the system itself.
Something which a 'no permanent injury' device like this makes all the more simple /because/ it doesn't give the user a case of the guilts in using it for a wrong cause (i.e. it is the difference between gassing Jews and shooting them as a 'bad for morale' manipulation of torturer as much as torturee).
And it works both ways for, if nothing else, this kind of device also underlines the _justification for a contempt of engagement_ by which small, extranational 'paid insurgents' can continue to best-cause damage by leaving more and more explosive surprise packages behind. Since that which blows rather than pops up to engage you is the easiest way to kill a multimillion dollar vehicle, 'en passant'.

3. Because of Max Range issues.
People have /no idea/ how long the engagement ranges of modern 'force on force' battles can be. 1,000 meters (half a mile, clock it off on your odometer and then 'look back') is /nothing/.
There are no 'static' battlefields between massed armies anymore, not because individual targets are so vulnerable. But simply because you cannot bring them all together at equivalent ballistic overlap without running shy of direct-fire space.
OTOH, 'crowd control' is a mechanization of a few blocks standoff at most. Hence the idea that you are doing less harm because you need less force is implicit ONLY to the notion that the soft-target is also a soft-threat. And that means the wolves whose loyalty we buy with treasure-for-blood tax dollars, we can no longer guarantee the humility of once they have weapons that are ONLY useful if turned against us. At short range.
In this it is ironic, because the first thing I would do in Iraq is put into effect would be a 'Wyatt Earp' law equating to No Guns In Dodge.
But the Iraqi's, brutal exponents of of unconventional-warfare that they are, by /intimidating the U.S. forces/ from shooting every man who dares to bear arms are proving a kind of Hill Billy Logic that those who have guns are not 'eligible' for engagement by anything but lethal force. And so will not be engaged lest their massed slaughter be seen as 'cruel and unusual'.
And even a Knee Mortar or RPG probably challenges as much the acquisition system as the 'fires' delivery means of this device.

CONCLUSION:
Bad as it is, industrial technologic combat is at least honest in it's horrific nature and a 'sport war' which only experts can play at. Forcing us all to make continuous moral choices about whether the goal and the risk are mutually compatible or unthinkable.

I think we will rue the day when war becomes so easy that a general has no more 'can do!' fear of the occupation than he does the 'active combat' 10% of it's initial military rollover of the existing government.

And weapons like the active denial system will make it all the harder for 'protests at home' (Kent State with a millimeter wave gun, better or worse?) to become so ardent as to shock-awake those who would otherwise just sleep through the intermission in human decency we call 'just war'.

KPl.