Is that fence you're sitting on hurt much?
What will YOU do when you own home is being staked out by folks you d*mn well KNOW don't belong to the neighborhood OR across the street?
When carrying concealed, a person must exercise even more caution than usual. Zimmerman could have avoided the incident by staying in his car. Once attacked, Zimmerman had every right to defend himself. There is no contradiction in my position nor fence sitting. We have a neighborhood watch. They do exactly that — watch. If someone is actively committing a crime and the police are not present, then this watch would do more than that.
As for someone staking out my house, I would call the cops but I would break out my rifle just in case it was necessary. Such a scenario would vary my response depending on the circumstances.
I carry concealed all the time. When I do, I am even more cautious than unusual when dealing with potential problems. I avoid arguments and other potential problems with other people. If Zimmerman had been more cautious, he could have saved himself a lot of trouble. IMHO.