It was an open question, not a statement.
In most places "maturity" is defined as somewhere between 18 and 21.
In some parts of the USA - you can drive a car, fly a plane, buy and own a gun...at 16.
Sure, Swartz was well aware of what he was doing - and probably the consequences - while pursuing his agenda.
TPB boys were also pretty arrogant, even abusive to their critics, while confident of what they thought were their "rights" under Swedish law.
Does that mean that they deserved to be driven to suicide, or sentenced to hard time?
Personally, I think no, and that the Judge in this case made the right call.