Bernie Sanders logic

Here's a real argument Vermont's socialist U.S. Senator Bernie Sanders is making. See if you can follow along with his creative interpretation of logic. From his official Facebook page.

If you're not able to view the imagine, it reads:

Here is the defnition of greed: The Koch brothers - worth $85 billion - now want the Republican candidates they funded to cut Social Security, Medicare, Medicaid and nutrition programs.

I wasn't sure where he was getting these specific claims that the Koch brothers want to cut Medicare in particular. I couldn't see a confirming link anywhere, but looking through other statements from Sanders turned up a similar social media graphic created by Sanders' office: It read:

Want to know why the Koch brothers are spending hundreds of millions to elect right-wing candidates? Read David Koch's 1980 Libeterarian Party platform. It calls for the elimination of of Social Security Medicare, Medicaid, public eduation and the EPA. Surprise, it also calls for more tax breaks for the rich

There are more related images made by his office to share on social media from his office, but you get the idea. In addition, his official website has a post on this topic detailing his position. Sanders' basic argument is that in 1980 the Libertarian Party as a whole drafted a set of policy positions and chose David Koch as their vice-president candidate, so he much agree with each and everyone one of those views 34 years later, and by extension, so must his older brother.

If that were true, that we should assume all people never change their political views over the course of several decades and political candidates agree 100 percent with their party's stated platforms, than how does he explain his separation Liberty Union Party? That is the Vermont socialist anti-war party Sanders belonged to when he ran for governor in 1976 and in several other elections.

Today members of that part consider Sanders a traitor to their views and refer to him as Bernie the Bomber for his votes to mobilizing the American military on multiple occasion. Clearly, he has changed some of his positions over time and is not in tune with his party's old platform. Fair enough, but why does he wants us to think that David Koch can't change his mind too?