Why was Kimi's car allowed to continue with a large piece of metal exhaust hanging off, when it did eventually fly off it luckily flew safetly onto a piece of grass when it could just as easily gone into the crowed!!!
You make a valid point but, as far as I know, there haven't been any complaints about it, so I assume it's been deemed as acceptable. Formula 1, by nature, is a dangerous sport, and to eliminate every single danger would mean a queue of cars travelling around a race track at 30mph and indicating when they turned left or right. Not very exciting.