Police may not ask for your cell phone when they stop you for speeding, but they still have the option and you never know when it will become standard operating procedure. Also, if you are arrested, there is a presumption that you have 5th amendment rights. However, when you are driving certain rights are considered to be waived.
The danger is that law enforcement will make the assumption that rights are waived and they can use the information found in your cell phone to launch additional investigations.
The American public never knew the truth about what was happening in Nam. There was a concerted effort to hide the truth. Walter Cronkite was the last of a breed of reporters. He was more concerned with accuracy than rumor, However, he was wrong. The war was winable, but the politicians were more concerned with getting elected to additional terms.
The greatest generation sent their sons to fight a war without reason or support. At least sons and grandsons of Vietnam Vets are not being called "baby killers", or being spat upon.