How naïve and short-sighted. A constitution is a legal document that protects and ensure your rights and liberty. However, those who don't value their rights and liberty and take them for granted don't really deserve to retain them, anyway. Keep in mind that it's the level of freedoms that separates the great nations from the miserable, backwards cesspits. Perhaps in some strange way people find comfort beneath a boot heel?
We sort of set up the Rights and freedoms most other countries now take for granted.
Over the Past 2000 years we have gone from nothing in the way of freedom,Through Magna carta and the common law.
All are freedoms are based on established Law, not a written constitution. Every so often Parliament tries to go too far with new laws, and then the courts throw them out again.
Parliament can get pretty unhappy about that, but that is the way it all works.
When circumstances change and old laws become redundant parliament can revoke them, but even then most laws need to be tried in court to fully establish them. Unlike the USA the courts are not part of government. In many respects they are superior.
A written constitution fixes things in time and finds change in circumstances difficult to accommodate. Our system is far older and has learnt how to be flexible centuries ago.