Well, indeed there is. Shouldn't Russians share some collective responsibility for their government actions? I guess, in this case this was this specific person's share of responsibility.
(I'm not sure if you're from the US or not, but let's just assume you are) -- how responsible do you feel for the vast amount of war crimes commited by US soldiers in the middle east over the last few decades? Shouldn't Americans share some collective responsibility for their government actions?
Of course they should. Aren't Americans democratically electing their government every now and then? Does the US foreign policy ever change in any significant way during the last 40+ years?
First, since when collective responsibility became a good thing? Being responsible for things you never did is not something you want for yourself, so why want it for others?
Second, it's not only that guy who's at loss, it's also all the people who used or might use his software. Are those people responsible for Russian government's actions too?
Since when are Russians responsible for the guys currently in charge of them, is that what you ask? Since around year 2000. The same bastards are elected. Every. Freaking. Time.
Why shouldn't people who collectively, i.e. en masse, support their government by actively disrespecting other country sovereignty and border (e.g. visiting Crimea) shouldn't be hold responsible? I think they should! And it looks like I'm not alone, check out the list of countries who support sanctions against Russian companies and individuals.
As for the damage done to the OSS, I believe it's pretty minimal. He'll just move his stuff to GitLab, end of story.