Besides stating that you are stupid, NM and most other states allow you to use lethal force to defend yourself against severe harm or lethal force. Since the left has killed about 150 million that did not share their beliefs I keep this in mind when dealing with these crimminal losers.
The victim in the article could have used force to defend himself, and in some states could have used deadly physical force, but this poster was only referring to simple ("they put a single foot on your property") trespass.
Even if someone who had beaten you before trespassed, that would not give you athority to shoot them just for that trespass.