Plot hole: At the end, when Chris finds the informant's phone, he sees that there are 2 voicemail messages. Instead of listening to them, he calls the last number, which reveals Abel is responsible for the break-in when he answers and in turn reveals to Abel that Chris knows about the break-in. It would make more sense to just listen to the voicemails, as Chris became immediately suspicious when he saw them. Considering Chris called the last number, he must have known that the last number was also the person who left the voicemails. Very deliberately done to bring realizations between Chris and Abel for a climax.
Plot hole: When Chris finds the informant's phone and calls Abel, it makes no sense for Abel to answer the call: Abel wouldn't answer the number of the phone he is trying to find and get rid of in order for people not to find out he called him and ordered Chris's house vandalization. Also, he knows the phone is somewhere around the house and looks for it there, and having seen Chris get it, he can easily deduce Chris found it - which only makes his decision of answering nonchalantly all the more peculiar.
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 ★