Because most people have stopped giving a fuck.
I'm serious. Remember all those memes a couple of years back about not giving any fucks? Their chickens are now coming back to roost.
A lot of people have simply decided that it was no longer worth the effort to try and be a good person, and to just shut themselves off and take care of their own needs. And perhaps it was necessary at the time because they were simply tired of putting in effort while others decided to take and take and give nothing back, but clearly, this isn't a viable long term solution. The Roots put it quite well in their song How I Got Over:
Out on the streets, where I grew up
First thing they teach you is not to give a fuck
That type of thinking can't get you nowhere
Someone has to care
The less people care, the colder the world grows. If no one does anything charitable, every interaction becomes a matter of win or lose. Now I'm well aware of just how difficult it is to be kind in a world full of greed where everyone seems to want to take advantage of you the moment you show any sign of weakness, but unfortunately, that is the only way anything will ever change.
For if you love those who love you, what reward have you?
Do not even the tax collectors do the same?
And if you greet your brethren only, what do you do more than others?
Do not even the tax collectors do so?
Therefore you shall be perfect, just as your Father in heaven is perfect.
Matthew 5:46-48