I live in Wichita, and Koch is big shit around here. They do a LOT of philanthropic work. Just a small example that personally impacted me, when I was in high school they funded a class called Youth Entrepreneurs of Kansas. They gave every student in the class a "biz bag" which was actually a fairly nice messenger type bag with receipt book, a nice electronic organizer/Rolodex, not a cheap one either, and 3 different text books, a business plan workbook that I could probably make use of tomorrow if I were starting a business, it helps you figure out ALL the financial stuff, how much you'll need to sell, how much you'll need to charge, what your ROI will be and when and a bunch of other stuff school and business related. IIRC each bag was worth several hundred dollars worth of the supplies provided by them free of cost provided you didn't just skip out with the bag and not participate in the class.
In addition to all that at the end of the year they paid for our class to go to sam's and buy supplies(each group of 5 students got I think $75 for buying supplies) to run a "small business" in the school. We got to keep all profits and didn't even have to pay back the original $75. The students were held accountable for their biz bag basically as long as you saw the class through til the end and didn't just drop out and not return the bag it and everything in is was yours to keep. It was a great learning experience and made a big difference in my life. My sister also took that class IIRC.
Nothing like that would have happened in our school would have happened without their support. As far as I know that program is STILL going 15 years later. That's not pissing money down the drain for welfare, that's taking kids and trying to help them WANT to make something of themselves.
Another part of the class that I found pretty interesting was we did a stock purchase as groups, and we got to see how that all worked, as high school kids, something most high school kids probably at that time didn't know about.
I also know several people that work for them from security to accounting and ALL are well paid. So I have a hard time with anyone that tries to say they're evil, when my albeit fairly limited experiences with their works have all been very positive.
Libtards just hate them for being rich and conservative, nothing more, nothing less. If it wasn't them, it'd be the next biggest donors on the list.
ETA: corrections, formatting..some other shit