What is your point? Just let hoods burglarize the homes? GZ had every right to find out who TM was and why he was acting suspiciously. GZ did confront TM, he called police to report his observations. TM attacked him after he headed back to his vehicle, contrary to your assertion.
Are you 12 years old? This is a grown up issue.
As someone that is considerably older than 12, I know that what one person considers to be suspicious behavior, is not always considered suspicious behavior by others.