I think your claim is ridiculous. Please explain why stalin's purges in the 30s, the decision to occupy and install puppet governments in eastern europe, and the failure to reform the economy in the 80s (perestroika) was the fault of the tsars.
Please read my statement again, perhaps without vitriol this time:
>but most of the important, nation-wide decisions were obviously affected by how (dismally) Nicky ran things.
Observe the word most. Just as I was saying the tsars definitively were responsible for most (note the word carefully again) of the momentous decisions later, it should be painfully obvious that they weren't responsible for 100% of all actions forever after. This is ridiculously obvious in any non-insanely polarized debate, which unfortunately isn't always the case of HN.
Most is at least over 50% (I would say "most" implies 70-80%). Your statement as written implies that 50+% of the important decisions made during soviet times were influenced by the tsar's previous actions. That is (still) ridiculous.
You can't.