The destructive urge, said the anarchist Bakunin, is also a constructive urge, presumably because one can, at least in theory, build anything one likes upon a foundation of ruins. The cities of Dresden or Coventry do not really bear him out; but these days the destructive urge focuses more on intangibles, such as social limits or boundaries, than on buildings or infrastructure.
Modern man seems unwilling to accept any inherited limits or boundaries, which is to say any that he has not set for himself or that cannot be justified by a valid argument starting from an indubitable Cartesian point that he acknowledges as such. I suspect that this unwillingness is the consequence of the mass rise in self-importance, but that is by the by. Since we live in a social and even physical world composed more of continua rather than of categories, it is not surprising that limits and boundaries tend to dissolve under this intellectual regime: not any given limit or boundary, be it noted, but limits and boundaries as such.