I am going to make this as short as possible. My neighbors want to control us. The head of the household has spray painted lines on the curb and street designating where they want us to park. We have continued to park anywhere we can find parking. The neighbors have responded with read-ending our cars to park as close to them as possible.
I witnessed the neighbor's wife trespass into our front lawn and uproot and take a plant. When I asked the neighbors about the issue, the husband claimed he, not his wife, had only trimmed a plant. I called the police while talking to my neighbors, and the police would not come out because there was no real danger. The wife then stated that if the police came out she would say we stole a plant first.
The husband has broken a sprinkler on our front lawn on at least four occasions. His rational was the fact that his car gets wet. When we caught him in the act on the fourth occasion, my father and I told him that he should talk to us about the issue so we could address it. His wife and daughter then came out of the house and began to yell out as many foul words as possible. This only fueled the neighbor's anger. The neighbor then charged at my father and told him he was going to kick his ***. My dad did not move or say anything. I ran in between them and called the police. Sadly, the police did not come out because the neighbor was unable to touch my father because I got in the way.
The issues we have faced with our neighbors are many more, but these are the ones that concern me the most. I have told the police that we fear for our safety, but they have blamed budget cuts for not coming out. My response was to invest on a surveillance system.
Recently, my neighbor has been calling us out through our surveillance system. He points at the cameras and then signals for us to come out. Moreover, he has looked directly into the camera as he runs his index finger across his throat. I feel helpless. Is there anything I can do? I have contacted lawyers who have told me they would return my calls, but they never did! I can't even get the police to produce a police report.

Sounds like you are telling the police way too much info, beyond, there is a danger and you are in fear for your life.

You can go in and file a report if the police refuse to come,
You can file in small claims court a law suit for damage to plants and sprinkers and the such.

If you want to get a restraining Order against the neighbors, be aware that restraining orders can only inflame an already bad situation like throwing gasoline on a fire and the bad neighbor will only get worse due to it.

You have two options here. Move or put up with the drama. I put up with drama worse than you have for 11 years and then moved. It cost me a lot of money getting a restraining order for a year's worth of peace and quiet but once that year was over all hell broke lose. I had windows shot out and baseballed out in my home (one windows 3 times), taillights on my 3 cars BB gunned out, BB gun holes in my vinyl siding, freshly sodded lawn killed, my German Shepard dog poisoned, many big border bushes literally pulled out by the roots and other fun stuff.

I would suggest you save your money and move as you will not win and the cops don't have the time for such stuff unless you or any family member are acutally injured. Just doing motions like the cut the throat on the surveillence camera is not enough. As one cop told me "Call us when you are dead" then we can come. Yep. Sorry, but there is no easy slam dunk answer to your horrendous problem. Try to keep your cool and just ignore them.