My effective income tax rate is 50%, and then there is an additional 25% VAT on everything I buy. How much more of my income does the all-knowing Eli Gottlieb suggest I "contribute"? Perhaps I should give away the remaining 25% and go live on the streets as a declaration of solidarity?
You can only pay VAT on the 50% of your income that you keep (and that is presuming you spend all of it). So you have 50% * 75% = 37.5% of your income left to give to charity.
I also find it a bit interesting that you are OK (presumably) with giving away 63% of your income to the government, where you have hardly any say in how it is spent, but offended at the idea that you should give anything else away when you can choose where it goes.
Guess what? This story isn't about you.
There's poverty where you grow up on one box of macaroni and cheese per day and your parents are never home but you have a roof over your head and at least free school lunches. You're not actually dying or being exploited into human impotence. You just lack avenues to grow into a full and complete person who can escape poverty.
And then there's poverty once that same child grows up and the welfare system has been dismantled and there's no more public housing, so he/she is working two or three jobs just to afford a roof over their head, real food of any kind is unheard-of, and you'd kill for a good night's sleep or just one Sabbath meal -- if you had the energy to kill.
The latter kind, you can solve just by giving people money. At the very least, it raises them up to the former kind, and from there, all you might need to really improve their life might be a decent library or a community center or a good source of stable jobs.
There's no excuse for not contributing.