Doing good things, using bad methods

If someone steals a small amount of money(from a lot of individuals) and gives it all to charity, is that person doing a good thing or a bad thing? He/She isn't benefiting anything from this. If it was for personal benefit, that person can just steal all the money and keep it to themselves (or even keep some - if not all - of it to themseves like most theives do). However, all that money is used to either do good (helping poor people, planting trees, making the world a better place etc.), or get more money to do more good. The amount stolen from each individual won't affect that individual's life (e.g. some change in a bill), that he/she might not even notice. However, when all the small amounts are added up, this money can be used to do a lot of good things. The person who is stealing that money and giving it to charity is working hard(daily) not to get caught and keep the operation going. However, he/she is doing this in his/her free time to leave the world a better place than he found it. Should a person with the ability to do this, do it? Is it allowed to try to make the world a better place using methods that others mostly exploit for personal benefit? God has given me the power to do this, and I want to use it for good and have millions donated to charity. This can be done with complete anonymity, and without any effect on my personal life. Should I do this and make the world a better place, or is it forbidden?