The main reason this sort of attitude pisses me off is because it assumes -- arrogantly -- that hundreds of thousands of people stayed in the USSR because they were not as determined/motivated as some kid on HN. You simply have no clue how uninformed you are about the reality of that situation at that time.
Hiding under a train carriage to escape the country? Are you kidding!? Try it some time, it's harder than you might think.
My (Jewish) great-grandmother left the USSR in the late 1910's hidden in a hay cart at the bottom of a freight ship. I wouldn't be here today if not for that feat.
I am one of the people whose parents emigrated in 2004 as Christian refugees, btw. They had to prove they suffered from religious persecution (bible raids, not getting into colleges, etc).
The whole 'give me your poor and hungry' thing never really went away ;-)
I don't think that made it any easier getting out.