I, 23yo M, went to a coffee shop earlier today, and got in line. My 6yo daughter, Maya (not her real name), asked for a strawberry donut, and I nodded. A woman, likely in her 30's, whom we'll call Karen (not her real name), cut in front of me and my daughter as the line started to move. I explained to her that she cut us, as politely as possible, and she lost it. She went on to shout that "strawberry donuts are gross", and Maya began to cry. I explained, in a whisper so Maya wouldn't hear, that strawberry was her mom's favorite flavor. Unfortunately, Maya's Mom, the love of my life, passed away a year ago from breast cancer. Karen then seemed to show some sympathy. She crouched down to meet Maya eye-to-eye, and asked," strawberry was your moms favorite?" Maya nodded. After a moment of silence, Karen said," she was an idiot. You should be happy she's dead." Maya started screaming and wailing. My papa bear instincts kicked in and I gripped Karen's shoulder and pulled her away from Maya. I then yelled,"WHAT THE HELL IS WRONG WITH YOU?!?" She then asked," what's wrong with you? You must've been a terrible husband for your wife to let the cancer win." I have a bad history of anger issues, and she had just crossed the line. However, I couldn't let Maya see me like that. I just closed my eyes, took a deep breathe, and left with Maya. I watched Karen pull into the parking lot, so I knew which car was hers. As we walked past her car, I stuck my Air tag to her car. As Maya and I drove away, I called my sister and asked her to watched Maya, claiming there was an emergency at the office. After that, I tracked the air tag and found out where Karen lived. Before I met my wife, I worked for a 3-lettered government department that could make it seem like you never existed. I pulled out my laptop, and, via a backdoor into her wifi, I was able to connect to the entirety of her house. TVs, game consoles, computers, but most of all, her security system. Cameras, mics and speakers were mine to control. I drove home with my newly acquired reality television show, and started writing a program. The one I developed made it to where each speaker played a quick, random sound every few minutes. After a couple of hours. Kare started tearing her house apart to find the crickets, kittens, dropped pens, and, my personal favorite, smoke detectors in need of new batteries. After that, I decided to go a little further. I connected an AI narrator to the speakers and told her, "The cops are on the way. A warrant for your arrest has been issued. Controlled substances, unregistered weapons, murder. All charges the you are being accused of." This notification played over and over again, accompanied by a blaring siren. After Karen screamed, packed some clothes and jewelry, she left. I haven't seen her on the cameras for the past 3 hours. I know it's a bit too far, and I do kinda feel bad. However, I'll be damned if I let someone disrespect my late wife and our daughter. So, am I the a**hole?