I have never heard anyone advocate that viewing of such drawings be encouraged. Allowed, yes, encouraged, no. As someone else mentioned: we really do not know

I have never heard anyone advocate that viewing of such drawings be encouraged. Allowed, yes, encouraged, no. As someone else mentioned: we really do not know how availability of such cartoons affects demand. It is possible that the opposite happens: that the cartoons take the market share of and thus reduce the demand for the real pictures. Note for example that if the perversions which fuel demand for this stuff are genetically determined, then the above market dynamic is quite likely.