My Personal Need For Security Items Comes Up Again

I was looking at a house to possibly buy today.  I was alone and a man came buy, looked like he was in his late 40s, needed a shave and started talking to me about the house asking what I knew about it.  I answered him and then he started telling me to be careful what I buy as it's such a bad economy.  He then kept talking, going into a rant about our government and how, in his opinion they were making things worse on purpose.  He said the government was trying to make our economical system collapse so they can rebuild it and end capitalism.  He kept going on and on and started getting more and more uncomfortable, he even shut his car off he was talking for so long.  He was probably harmless but who knows, I certainly didn't and to make matters worse, I couldn't get away from him.  I finally get my keys out and started to walk away slowly and he get the message, I was so relieved when he left.  I then walked up the long driveway ( I had parked up at the top of drive and walked down to the road) that's when I met up with him.  I wished I had some sort of safety device like pepper spray or a taser gun or anything in case this guy was a loony but I was totally at his will, he could've attacked me.  I am again seeing my personal need for safety technology for my personal safety.