Not a Russian myself, nor do I care about any specific Russian athlete, but accusing Russia of systematic doping and not pointing a finger at other countries' systematic doping is just ridiculous. I guess the difference is state manipulated systematic doping versus the state knowing about doping and turning a blind eye. Honestly, it's equally bad.
The point is, these were caught... the others weren't.
Yes it is true that there is doping in other countries, but either it has not been detected yet or what has been caught are individual athletes, without government support or knowledge of the countries' federations.
In the case of Russia, the problem was discovering that the federations were involved in the problem. In other words, it was not the individual athletes but the institutions representing them that were involved.
I am not sure if other athletes were given the benefit over the Russian athletes on doping case but whoever is involved in this should be punished regardless of the nationality. Cheating and using unfair means is a sin in sports but giving undue advantage to players of certain nation is even a bigger sin.