Stupidity: Abel sends a video next door showing Chris being sexually assaulted by a stripper at the bachelor party, which would actually get him in a lot of trouble as the video shows him encouraging it. Yet, for some reason, Chris and Lisa don't bother to use this important piece of evidence to make a case against his harassment of them.
Stupidity: At the end of the film, Abel had nothing to gain from lying about having a gun to the police officer. He had no way to prevent Chris and Lisa from presenting the informant's cell phone and exposing his involvement in the break-in and vandalism of the couple's house. Additionally, testing from the shots fired in the house and the car would prove that there were two different guns involved. As a long time police officer, Abel should have known that giving up the gun would have been the easier way out instead of lying about it.
Answer: Abel was mentally unstable and that drove his overall behavior. His initial antagonism about Chris and Lisa started with a variety of factors including them being an inter-racial couple, Chris' smoking, and the couple listening to hip hop music. This was all exaggerated in Abel's mind, and continued festering. Abel's late wife had an affair with a white man, which seems to be a factor in his objection to any inter-racial relationship and distrust of white men. It's implied that Abel's extreme, controlling behavior is what led to his wife's infidelity.
raywest ★