Because every Tom, Dick and Harry with a bender and welder thinks they know what they’re doing. They think their cages are safe, they think their welding is good. Just adding random bars to the interior of a car does not always make it safer.
In the last few years, I seen some cars with the most hideous shit. Bars that I’m sure would come apart in the event of a crash.
What do you think a 1.5" bar would do to a skull if it’s rattling around the interior of a car during a collision?