There are a lot of individuals who have the ability to provide those resources.
Even if that's a bad example, there are innumerable examples where individuals do choose not to help others in the same way that corporations don't.
Frankly, nearly every individual is doing that by not volunteering every single extra dollar and minute they don't need to survive.
You've now turned a moral willingness-to-help problem into a logistical and coordination problem.
What you suggest requires entire organizations to execute properly. These organizations do exist, such as Doctors Without Borders.
I don't think your original claim is fair, which amounts to "any surgeon who does not participate in Doctors Without Borders is just as bad as a landlord who evicts a family during winter".
What do you think we owe to one another, philosophically?