Diversity Plaza is a symptom of the neighborhood in general. If we want to change the condition of Diversity Plaza, we will also need to do something about Roosevelt Ave, and 82nd Street. This will involve not accepting, or rationalizing, most of the degenerative behavior that contributes to many of the problems in the neighborhood. We need to come together and constantly complain loudly about the gangs, drug dealers, prostitutes, overcrowding, spitting on the street, etc (and before anyone starts telling me to move back to Ohio, I was born here, in Jackson Heights and never left NYC).
A good start would be to pressure, en masse, a clean sweep of Roosevelt starting with shutting down all of the bars on Roosevelt between 75th and Junction. We all know what these places are like. In short, if a bar or restaurant is attracting a clientele that requires security, it should be shut down.
We also need to crack down on the groups of drunks who have started populating various street corners. They harass women, start fights, and are generally not contributing anything to the community.
We can be in control. We just need to be willing to take action and pressure our elected officials who tend to be overly sympathetic to the people who are contributing to the poor quality of life in our corner of the world.