Wiki definition-
"A politician is a person active in party politics, or a person holding or seeking an office in government.Politicians propose, support and create laws or policies that govern the land and, by extension, its people. Broadly speaking, a "politician" can be anyone who seeks to achieve political power in any bureaucratic institution or organization ."
"Political power" is a dangerous thing when some have it. Long term political power is even worse and Congress has many members who have been in office for 30+ years. Biden entered Congress in 1973 and left only because Obama was elected and chose him as his Vice President but as VP, he was the President of the Senate, so he didn't actually leave.
The definitions vary greatly, but some of the reasons Trump ran is because, as he used for a slogan, he wanted to clean out the swamp of lifetime members of Congress, people making shady deals (look at the 2008 Stimulus package, called 'Porkulus' by many because of the many additional gifts given to corporations). He thinks many politicians are political insiders who are out of touch with ordinary Americans. I don't know if you heard about it, but after the Stimulus was written and people commented about the 2700 pages that nobody seemed to have read, Pelosi said “We have to pass the bill so that you can find out what is in it, away from the fog of the controversy.”.
No, Bills are read Before ratification. Not reading them is the best way to prevent us, the citizens, from seeing what they're doing to us.