I personally know cops and other law enforcement that see the constitution only as some kind of barrier to their fun. I didn't elect these thugs and I don't need them to protect me.
And I personally know cops and other law enforcement that work hard to help keep our society safe, regardless of the risk to themselves. What's your point?
I did not elect the police either, but I am very glad they are around. If my 4-year old son is lost or in danger, he knows he can ask a police officer for help. If I am driving too fast, I deserve to get a ticket -- and if I flip my car, it is likely there will be a trooper, cop or sheriff there in minutes, calling in aid and trying to rescue me.
Police aren't there to protect you. They come after you've already been assaulted and robbed or otherwise violated and investigate. Usually they take your report, file it, and never think about it again. Unless it's a murder or other forcible felony, you're never going to hear another word about it.
You make a valid point about many investigations and reports ending up without activity, but this is a comment more on the nature of our society and the inability of the police to follow every lead than anything else. In order to "solve every crime", which is obviously impossible, the police force would have to be huge -- and I imagine you would have some serious complaints about that! I would as well. But your point about the police not being there to protect you, or that they never think about the crimes they see once they've filed their reports, is ridiculous.
Do you like the media calling all tech-savvy people "hackers", and then misdefining that as "super-genius young male loner-types who break into systems for fun or money"? Is that you? Then why do you proceed to take the same approach to law-enforcement, painting them all with a negative brush that applies to a very few?
We rightly hold law enforcement officers to high standards because of the authorities that they have been given, and because of this I think we should be allowed to record them whenever they are performing their public duties. If nothing else, this is ought to fall under the heading of public accountability used elsewhere. There's nothing special about video recording; it is simply the best method for auditing a primarily physical job.
As has been pointed out, you might find people will respect your opinions more when you voice them with less vitriol and hyperbole and more reason. There is a difference between being heard and being listened to.