David Koch was one of the world's top philanthropists, donating more to cancer research than anyone in the world, funding leading scientific research aimed at improving lives through places like John Hopkins and MIT, leading a coalition of groups including the ACLU on criminal justice reform, was an early supporter of gay rights and gay marriage before it was popular, spoke against the military industrial complex and the drug war...
And yes, he contributed to a political party some of you didn't agree with, even if he specifically opposed their current President.
Politics is literally part of everything. Every political action has direct ethical implications and reflects one's moral character. Every vote, comment and dollar spent promoting or opposing various candidates or policies has real material impact on the well being of others, including their very existence. And when it's $ at the level Koch spent, those others number in the billions.
So, the canard that "it's just politics, but he was a good person" is utter bullshit. His politics directly determine what kind of person he was, it wasn't good.
As for him "opposing Trump", the decades of lies, anti-science, and bigotry that Koch spent billions promoting are what put Trump in office. Koch laid the ideological groundwork upon which Trump built his campaign. Without their Koch brothers efforts, it is unlikely that Trump wins the election. Also, their donor network spent over 400 million to help the GOP in 2018, and the since the GOP has fully supported everything Trump has said and done, every dime of that $ has increased Trumps power to do the massive long term harm he's done. The fact that he has criticized a few of Trump's protectionists moves b/c they hurt his own wealth doesn't mean shit. Koch wasn't spending any money that would threaten Trump's re-election and was still going to spend millions to ensure a GOP victory in 2020, which would help Trump.
He funded political causes he thought would benefit humanity,
So did nearly all of the most destructive, immoral people who ever lived. Like all of those people whom we should wish dead, he chose to hold an ideology of "what would benefit humanity" that was objectively wrong and destructive to most of humanity, and convinced himself otherwise for purely selfish gain.
and you disagreed with some of his proposed solutions
No. We disagreed on what the problems were and with his massive role in causing those problems and spreading lies to prevent people from recognizing those problems. We disagree with his Randian lack of moral compass and the objective harm he caused countless millions by everything from nearly 30 years of promoting scientific illiteracy and climate change denial ensuring that the GOP would oppose any meaningful actions, to his funding of white nationalism in a number of ways including funding "neo-confederate" pseudo-historian professors to lie to college students about the realities of slavery and the civil war. Much as he funded economics profs who would lie to students about economic realities.
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He was a piece of immoral shit, and him giving away what for him was pocket change that he'd never notice to a few good causes doesn't come close to the far greater sums he used to cause objective harm. In fact, even much of that charity was destructive and self serving. While some of his charity did good even when it was done for mostly selfish reasons (like his large donation to cancer research immediately after being diagnosed), a good % of his "charity" was actually designed to cause harm to others and society in ways that benefited himself, such as the funding of right wing propaganda under the guise of funding education. That includes not just the funding of white nationalist "historians", but also of selected economics profs who would push a specific dogma and political agenda that benefited Koch's personal wealth. Investigations of where and to whom he "education" donations went clearly show this. And Koch admitted it way back in 1974 when he said to a gathering of like-minded economic conservatives that "educational programs are superior to political action, and support of talented free-market scholars is preferable to mass advertising."