Because, at the same time that this is happening, the capacity for a single actor to wreak catastrophic destruction or violence is increasing. If that "viable option" increases the number of discontented people who increasingly have access to WMDs (or that support actors who can, given enough of that support), you increase the likelihood that someone has the motive to blow everything sky high.

Also, you're wrong. Egalitarianism has meant a lack of luxury relative to what was possible at the time, but a better baseline for the population as a whole.