Everyone lies. Everyone.
You lie, your mother lies, your father, your priest, your 2nd grade teacher, your doctor. And yes, politicians lie.
Also, politicians promise things they are not always capable of delivering. Electing novices would, I wager, vastly increase the number of missed electoral promises -- because the n00bs will not know the limits of their powers before they get into office.
Fun fact! The number of independents is on the rise. While many people do still utilize this kind of ideological adherence, a big slice of the electorate does not.
And again, it is not clear how electing novices fixes either of these issues. They still need to campaign, they still need to get elected, they're still going to say things that they can't accomplish.