Even if all you care about is yourself your survival depends on others. Both their helping you acquire the things you need and their not actively wanting to kill you. Societal collapse is your problem.

Now try to convince other people that they should do what you say. Not gonna happen, there will always be people that are selfish. That's one of the reasons why communism failed, there were too many people which didn't care about others or were just plain parasitic. I heard one phrase which sums communism up perfectly "Whether you stand or lie, 2 thousands is due" which means you can go to work, do almost nothing and still earn because employment is guaranteed. Not everyone is caring like you or me. There are many assholes, I'm sure you've seen some in your life.

> Now try to convince other people that they should do what you say.

What am I saying people should do?

Then maybe you should move into the woods and see how many resources you can acquire for yourself without the help of others.

Aside from the callousness of your remarks, you do realize that having 19 bones isn't an absolute, right?

Once there are only 19 dogs left, the number of bones will simply be reduced to (slightly more than) 18, because the prevailing ideology is that there must be 5% unemployment. (This is greatly simplified, of course, but that's the gist of it.)

Eventually you'll stop being lucky. And in any case, it's not always the same dog who gets unlucky. So yes, it is your problem, or at least it will be.