I agree with you that there are many liars among our mis-leaders, in both parties, in all 3 branches of government, at every level of government, in the military-spy global empire, and of course, among capitalist corporations.
For example, I voted for Obomber-Obummer in 2008 (I even gave him money 3 times!) believing that his “jive” of “hope & change” would be truly progressive – after the absolutely reactionary disaster of Shrub.
Ironically & Tragically, Obomber-Obummer destroyed my “hope” even though “Hope” was his “big lie” campaign motto. (Remember the famous poster of his arrogant, “chin up” mug with “HOPE” printed below?) His oligarchy-favoring policies and personnel quickly made me feel terribly lied to and betrayed!
Then I suffered the DNC-Democratic Party’s lies and betrayal in the 2016 primary elections that prevented my preferred candidate, “barnstorming” (partial-socialist) Bernie Sanders, from rightfully winning the Democratic nomination (and the U.S. presidency).
Then I suffered the betrayal of Bernie refusing to run with Jill Stein and the Green Party in late 2016.
Then I suffered the betrayal of Bernie supporting crooked, warmongering Hillary Clinton and also “sheep-dogging” many progressives into the corrupt Democratic Party that had just recently betrayed him and his millions of supporters! (Because Trump was a “greater evil” than Hillary.)
Of course, this is just a partial, recent list of all the lies and betrayals that all of us “common” citizens suffer every day in this “lie & betrayal” of a so-called “democracy”! (Even former U.S. President Jimmy Carter says the U.S. is NOT a democracy – but is an oligarchy with unlimited, legalized, political bribery!)
So yes, I “never forget” (as you say) that “Many many establishment politicians in this Duopoly can “never” be trusted.”
But, despite all the lies and betrayals, I personally try to carefully balance my political skepticism and pessimism with political hope and optimism.
There are many good people in the U.S. and in the world – and sometimes the good people prevail. For all of us good people, I never want to give in to despair and I never want to give up.
In the end, we just might win “the good fight”!
But if we lose, let’s go down fighting (for The Good in this life)!