Hmmm NATO support back in the news?

Last year, my neighbour put a message into local chat group saying intruders were in her garden. With a couple of minutes there were 8 or 9 people and a bunch of dogs in front of her house. The intruders got away but she was now ok.

If peaceful countries trade to mutual benefit and an aggressor threatens a country, there is incentive to come to their aid as a collective defensive front against that aggression. That being the case, a centralised system such as NATO is not necessary. Ergo NATO is not there for defence.