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.
This is a loss for humanity, and humanity would miss him if it wasn't for the constant and undeserved demonization and vilification of a pair of people who's only crime was having the "wrong" politics and caring enough to fund their beliefs. He funded political causes he thought would benefit humanity, and you disagreed with some of his proposed solutions or maybe whether he should have been allowed to donate as much as he did, legally.
Maybe you're right and maybe you're wrong about the actual effects of his advocacy, but... find out what he stood for before you dance on his grave, especially if you don't even know what he stood for rather than what his opponents presented him to be for political purposes.