Assuming you meant "any good reason you can come up with not to give" then, yes, here's a reason:
People are voting for the State to take my money by force. Why would I compound that by voluntarily giving money to the very same people voting for it? It'd be like giving money to a mugger to ensure that he has enough for his needs.
FWIW, I do give to charities. The Heart Research Institute and the UN refugee camps organisation are two. But they're charities that I value, & they're not putting a gun to my head demanding money.
Who said anything about giving 10% of your income to the government? He _explicitly_ stated charities. The ones you give to are your own choice.
I'm sort of missing the part of the article where he states only to give to charities who are aligned with the US government. No one said anything about giving to a charity that gives Porsches to US Senators.
Again, it seems you either didn't read the article, or something -- he's not saying to give another 10% in taxes, he's saying to give your income to charity. Just because 30% of your income is spent in taxes, doesn't mean you can't give 10% of the rest of your charity who isn't aligned with the federal or state government. You could give it to a foreign nonprofit. It doesn't matter, just as long as you give.
I guess I'm just not understanding your argument. It's like going up to a kid's lemonade stand and refusing to buy on the grounds that you give 30% of your income in taxes. Spending your money on taxes and giving 10% of your disposable income to charity is mutually exclusive, except for the obvious fact that you receive tax benefits from giving to charity.