Its worse than that. A corporation starts a charity or gives 100k to one. Real nice right? Nope.

They will:

1. use that to decrease their tax burden, robbing the commons of their share of taxes to repair the infrastructure their semi-trucks and businesses disproportionately use and tear up. Then...

2. they ADVERTISE how noble they are, spending millions upon millions in ad buys to tell you what how awesome they are. Then...

3. They use such initiatives as lobbying tools to explain why their industry doesn't need to be taxed to institutionally, societally address the issue that is currently subject to the transient whims of charity.

There is nothing a publically traded corporation does that isn't done out of greed, that isn't calculated to provide more return than dispursment. Nothing.