In the old days peddlers were common place. I recall having the Fuller Brush Fellow and others peddling their wares as regulars on my porch or in my living room. I enjoyed their visits; usually purchased lots of fantastic little trinkets that were useful and lasted. This was before builders got the idea to make things that broke in order to have repeat business. My washer and drier still work after 40 years because they were purchased when the seal of purchase meant there really was value in the product; not the 2 -10 years warranty we get now with the contract we have to buy guaranteed to provide needed repair because the item will break, need repair, or replacement within 2-10 years.
Unfortunately for all of us, simple times when we trusted others has been changed forever. With the world in poverty, everyday crime has gone through the roof. You cannot go to a restaurant and not consider how to get out in case of a fire. Can't trust that you as a person matter enough for laws to be made to keep you safe; politicians are too interested in big business.
Now, I'm not saying that people did not commit evil acts; historic records noted that Cain killed Able spilling the first blood upon the land. What I am stating is that the way News is being reported makes criminals famous; they strive to have this fame. Where a hang man noose was a deterrents in the past, now days gangsters and killers aspire to commit the most horrific crime so they can be recorded in infamy.
Thus, unknown folks knocking at my door now days, do not receive an answer. If they leave a flyer, I'll look at it, then research their company on the Better Business Bureau, etc. We-The-People still have the right to refuse admission to unknown and unwanted people thus far. We can keep potential crime outside our home, and our home remains a safe haven for our family; unless 'the wolf is hiding in the chicken coop.'