All of the organizations you admire have computer systems, and substantially all of them suck. So you've got that going for you. Word to the wise: they suck for a reason, and finding out exactly why they suck may not be a pleasant experience for you.

You're wonderfully fortunate in that you have a skillset which scales to infinity and beyond. Many of the people who are doing things you think are important are working in the virtual stone-age. You can alleviate that, and give them force-multipliers which will let them spend more of their sharply limited time/effort/money on stuff that matters and less of their time/effort/money on doing largely worthless things in inefficient ways.

Feeding the poor: worthwhile! Inventory management which relies on having a woman with a graduate degree count cans and tally them on paper: waste! Human factors which make eliminating her 'job' sound like you are attacking 'the cause': substantial!