Nah. These fucks were bullies who were deliberately making the guy's life miserable. They were threatening him even in this video. There are people who have learned, through experience, how to harass and hurt others at a level that's just below what the local "authorities" will take seriously. They can carry on campaigns like this for years and be so adept at recording evidence to make any response from their victims look like unprovoked attacks.

That can take a serious mental toll on the victim. With no way to effectively fight back (unlike the bullies, the victim is not skilled in lies, manipulation, and sustained coordinated harassment) the victim eventually sees the only way to end the pain is to do something extreme. The shooter in this video was so broken down by this couple that the only way he had to stop their attacks was to end all of them.

If you don't see how that is possible, then you are either being purposely blind, or have lived a very sheltered and privileged life.