thanks for your attempt at answering. it does not convince anyone.why would they want to push false polls?
For several reasons really. There are a group of us that always want to be on the winning side no matter what, and will vote that way. They also want to discourage Trump voters from coming out. If the polls say it's hopeless for Trump to win his reelection, they are assuming some will just capitulate and stay home.
It's unfortunate that everybody is allowed to vote in this country. My opinion is that only those knowledgable about government and policies vote. We don't need Obama Phone ladies and Obama Money people deciding our elections. They couldn't even tell you which party leads the House or Senate.
Beyond that, polls are only as good as the honesty of the participants. The left has demonized Trump and Bush so badly that when asked, people are afraid to say how they really voted. Others consider voting very private and give false answers because they feel it's not anybody's business how they voted. This was evident in the Bush/ Kerry election, where all the exit polls showed Kerry killing Bush. They were all given false answers as to who they actually voted for.
the polling could also lead people to not vote for Biden or hillary in 2016 because they think their vote is not necessary. some might even think that a 3rd party vote could be cast without spoiling.
the most obvious error in your conspiracy theory however is that polling is a business. if they provide shitty polls, no one will believe them. that's why everyone is so skeptical in 2020.
In 2016 that likely happened as 63% of voters thought Clinton would win. 2020 will not be a problem as non-voters saw what happened in 2016.