Horn Assembly problems of the 2015 Toyota RAV4

We purchased a Toyota Rav4 with a 100% o. K. From Toyota dealer four weeks and 200 miles after parking in the garage the next morning it would not start several try's later it barley started, I am a retired mechanic, the headlights were normal bright with horn honking, the dealer told my wife the battery had 0 cranking amps they installed a new 80 month Toyota battery,. My problem is safety issues going to the internet and searching Toyota problems battery's, electrical shorts, electrical fires, stopping unexpectedly loss of steering, electric wire burn smell, I could go on my point is everything is tied together electrical issue with wiring shorts ! I don't want to sound like an alarmist but it might sound that way, something is causing all the issues with early battery failure, as a mechanic 50 years I have seen this before and almost always it is a electrical short some ware in the system, and in some vehicles you no longer have throttle cables or linkage you have electric assist meaning a motor or some kind of pressure sensitive device that can short and inadvertently cause the vehicle to stop or cause the vehicle to advance full throttle with no way to stop! I'm hoping some one will read this that can help put our minds to rest or please look into this issue, I am afraid for my wife and all loved ones driving these vehicles.

1st occurrence 1/4/2016: driving down an interstate with several lanes going same direction and the horn started blowing intermittently 2nd occurrence 2/26/2019: had turned into a parking space and stopped with motor still running, then opened door to check if I was parked between the parking lines correctly and the horn started blowing 1st occurrence: poor connection to horn to theft deterrent in security alarm 2nd occurrence: intermittent open circuit in parking alarm harness.