I watched the GP2 feature race today and saw some exceptional driving at the same time as some really bad racing. Perez came second to Maldonado their year and I believe was involved in several incidents but I see him as fairly mature in F1. The commentary team took great exception to this suggestion and I think it's wrong to tarnish all drivers with the same brush.
Il Leone makes a good point, Schumacher, Senna, Hamilton are all labelled as aggressive or outright racers so they are an aspiration for some. Then I also believe we have drivers coming in younger and younger, at an age where fear seems to be absent, cars are safer and going off track is far less punishing.
A combination of the may be a reason some are more reckless than previously, but it would be wrong to generalise,