What is the meaning of the word gainsaid in the sentence “the importance of discipline in the lives of the people of any nation or society cannot be gainsaid since that nation or society can only be organised with discipline”?

Directions: Answer the question on the basis of what is stated or implied in the twin passage.

Passage – I
To the Editor:
Life is too restrictive today. There are too many too-rigid rules. No smoking, no cell phone use, parking for handicapped people only, no loitering, no skateboarding, shirts and shoes required; these signs scream out at you everywhere you go. Next, someone will be passing a law against talking in public. Things have gone too far.
Civility is all very well, but what has happened to liberty? Why can't I use my cell phone in a restaurant? Why do I have to turn off the alarm on my watch in the movie theater?

Things reached the height of absurdity today when I was sitting in my car, waiting to pick up my girlfriend after work at Valley Hospital. There I was, parked at the ambulance entrance, listening to a Lou Reed tape on my newly installed custom sound system. I mean, I wasn't bothering anyone. But this security guard came over to me, asked me to move my car out of the way, and told me he would call the police if I didn't turn the music down! There are sick people inside the hospital, and they need peace and quiet, he whined. Sick people need good music to stir them up, I replied. And the next thing I knew, a police officer was writing out a parking ticket and telling me to move my car.
That's just one little example of my point, but I could go on and on. There are too many rules, too little liberty. Is everyone else out there as mad as I am? Let's join together and fight against restrictive rules!

Yours truly, 
Richard Sylvester

Passage – II
Dear Richard,
Various rules and regulations have been put in place to ensure that our society is peaceful and orderly. Indiscipline implies the lack of self-control and disobedience resulting in flagrant violation of rules and regulations which in turn creates disorder and chaos. Some acts of indiscipline result from lack of self-control. It accounts for immorality, bad temper and greed which in turn lead to stealing, robbery and other related crimes. In short, crimes of all kinds are perpetuations of indiscipline. Therefore, if one fights indiscipline, he or she is also fighting crime. In fact indiscipline and crime are bedfellows. It is discipline that creates productivity and wealth in a country. The economic, social and moral growth of the country and its resulting prosperity depends on discipline. If the workers of the country are not disciplined, production automatically goes down. If teachers are indisciplined, the educational system will certainly break down. Similarly, indisciplined parents or family create a breed of children who lack discipline and may turn out to be criminals. If our pastors and church leaders are indisciplined, there will be no harmony in the churches and the moral growth of the nation will suffer. Politicians who possess no discipline cannot lead the people and the end result will be chaos. Disturbances in the country may be attributed to lack of discipline on the part of the security personnel. Chiefs who are not disciplined cannot retain the confidence of their subjects and anarchy may reign in that community. Obviously, the importance of discipline in the lives of the people of any nation or society cannot be gainsaid since that nation or society can only be organised with discipline.

Yours truly,
Editor