Absolutely they should! Some people need to come up for some air and stop buying into this latest drama queen catch phrase.
Weigh the costs of replacing or reparing shot up or burned out patrol cars. They are not cheap. Now you have a surplus armoured veh to be used in times of unrest, at the cost of maybe a dollar to the department. Several officers and emergency types can be delivered to a certain location at once and in relative safety.They don't burn real easily, and can be driven away whille being shot at, saving the lives of those inside. They can also be used to rescue downed individuals. Sure you could use a fire truck for that... but the cost to repair that piece of equipment can be throught the roof.
For the grenade launchers... they are used for gas or smoke delivery.
Departments as a rule generally do not put such equipment into the hands of a nineteen year old who might not have even graduated high school.
If one can make the argument about militarizing the police by virtue of using 'military' equipment, it certainly would not be a stretch to apply those same senitments towards the firearms community and those who own and collect 'military surplus' firearms.
As for doing things in a proactive manner "like they used to be"... That might work in Mayberry, but generally not in the larger towns and cities.
I know of a department that used to allow the cops to get out and make contact with people on a regular basis, and walk their beats. That is called a "Beat Cop". That was later discouraged because it added to the response time for calls... the cops had to WALK or run back to their cars to respond to the call for service.
To eliminate the unneeded 'extra time' to respond, the department 'wisely' issued cell phones to everybody. The officers were told that because they had the phones, they could "conduct business" from the cars instead of having to drive and contact the person requesting the police... most of the time. The cost of doing business went up tremendously. Officers were seen constantly on the phones, and not talking to people in a one on one basis... So much for being proactive and being a good beat cop. People complained the officers were not visible enough or out of touch, preoccupied with talking on cell phones. It sure did cut down on response times and all, but it back fired big time on the human contact end. And who got blamed... the cop.
This is all with the background of a city with one hundred thousand people, and less than two hundred officers total. There would not be that much working the streets. Add to that the average number of calls for service hover around one hundred and fifty thousand. Do the math.
Then recalculate those numbers and calls for service when there might be only four officers on the street to cover some seventy-six sqaure miles.
And the icing on the cake... this city has consistently be in the top ten most violent cities in the U.S. per capita. Often it was number one in homicides per capita, and number one in the state for violence and homicide.
Militarization of the police??? Some folks just grab onto anything to justify their meaningful hand wringing and to complain about something they have no idea about. Mindless buzz words and catch phrases often fill the needs of those types to rally around.