I've been in the electronic security industry for 30+ years and have encountered this sentiment before. I would not want a home or business without a monitored alarm system and I make certain that my grown children have monitored alarms in their homes. I look at it as an extra measure of precaution for little investment. Many people don't bat an eye at spending $50 - $150 monthly for internet, TV and Netflix, but balk at $30.00 a month for alarm monitoring with remote access.
As for cameras, if you walk through most neighborhoods today, and if you know what to look for, you'll see an abundance of video devices on plenty of homes. It's no longer the novelty it used to be.
If a burglar breaks into your home and there is no alarm system, he/they may spend a lot more time rummaging through your home. If a loved one comes home and encounters the burglar/s, it could get quite dangerous. The burglar who trips an alarm has no idea where the patrol car is, or how much time they have, and is likely to spend little time attacking your home. A monitored system alerts you that your home has been violated, and to proceed with caution when returning home. I don't see it as a "catch the perpetrator" as much as it is a warning to the homeowner.
A monitored alarm system is also for fire detection, I have smoke and heat detectors connected to my home's alarm. If you do not have a monitored system when a fire breaks out, the fire department will roll when your neighbors see your house fully engulfed. A monitored alarm can get the fire dept. rolling much earlier, probably in time to stop complete destruction.
Also, environmental sensors are connected to my home's alarm system. In a 2 story home, with bathrooms on the second floor, flood sensors are quite nice to have. Should a toilet tank break, or a hose pops off, the monitored alarm sends a signal to the Central Station. Also, I have an Elk water shutoff valve which shuts off the main water supply when the flood sensor trips, all working through my Honeywell Vista 20P. My neighbor wishes she had flood sensors when her upstairs toilet tank cracked and she was out of state for weeks. We saw the water flowing down her driveway and shut off the main valve. But, extensive damage had been done and it took a few months to rehab the home.
Safe neighborhoods? Most of my installs are in "safe neighborhoods" because people call when after they, or their neighbor, have been burgled. I have done very few installations in "unsafe" neighborhoods. Burglars seek out nice neighborhoods too.