Do you think soup kitchens and food banks should only serve food to those who volunteer? MIT is a perfectly fine FOSS license.

No, but if someone takes the free food and builds a business by selling it to others, without giving anything back to the original places, it harms everyone other than the person doing that.

F/LOSS is not a charity or a gift, so your analogy is not appropriate. It is a social movement and philosophy with the goal of sharing knowledge and building software for the benefit of everyone. It invites collaboration, and fosters a community of like-minded people. Trust is an implicit requirement for this to succeed, and individuals and corporations who abuse it by taking the work of others and not giving anything back are harmful to these goals. Copyleft licenses exist precisely to prevent this from happening.

MIT is a fine license for many projects, but not for an operating system kernel.