Oh gee wiz...anyone in here see acro planes, student trainers, even tprops and bizjets during training, people are standing on the rudders, back and forth all day long, year after year for decades...not one tail has fallen off..
Are you seriously comparing those to large jetliners
Have a read about the square cube law.
In mathematical terms, the law states that when an object increases in size, its weight multiplies faster than the strength of the structure that supports it.