I think that there are two main reasons, both of which have a direct correlation to the boom in connectivity and information flow.
The first is perception. While I think that there absolutely is a rise in this sort of behaviour over and above the natural generational evolution, we are also far more aware of that which always existed. Sensationalist reporting and the constant news cycle means that we have a distorted view of how frequently these sorts of things happen. It's a problem, but not to the extent that our perception indicates.
The second is how quickly and broadly ideas are communicated. This is a double-edged sword - while we benefit from global collaborative thought, stupid ideas are spread just as quickly as good ones. Ideas such as the demand for rights without the acceptance of responsibilities. The expectation of unfettered choice without the burden of the resulting consequences. The rejection of the reality that failure is every bit as necessary as success, and the insistence that the successful shouldn't be celebrated for fear of offending those that fall short.
And that's to say nothing of the idea that vapidity and notoriety are more admirable than merit and accomplishment.
As a society, I think we need something of a moratorium on finding new ways to absolve people of the responsibility of accepting the consequences of their choices and reinforce the idea that these consequences are a fundamental and necessary aspect of freedom. Faulty values that appeal to the unmotivated and/or incapable have been propagated, passed on to our children and continually reinforced to the point that they are seen to be desirable, and we are reaping the results.