Yeah, that's what happened, although your numbers may be high. Let's for a moment assume that they're correct, OK?
First of all, we know that none of them had any weapons. That was one thing about which the Nazis made sure.
Second, we know that in many gassing operations, there were attempts to keep the Jews ignorant until the very last moment. Therefore, they were waiting to be gassed but didn't know that they would be gassed. The Jews who had already been taken away were, presumably, being deloused. After all, this is what your side says happened at Treblinka.
Third, look at this map of Treblinka:
http://deathcamps.org/treblinka/pic/bmap9.jpg
See the area on the lower right where it's labeled "Reception Camp"? That's where people waited. We know the death camp was 10,000 square meters in size (the upper right of the map), and the Reception camp is bigger, right?
But we'll stick with 10,000 square meters. Now a point of comparison: Union Square in San Francisco is 9,500 square meters (from Wikipedia). So we'll go with that, which continues to serve your point and not mine.
Well, 8,000 people demonstrated there in late 2002 to protest the impending Iraq War. Pretty damned close to your estimate, no? And that's with more than a square meter per person, which is a lot of room.
And, as demonstrated by none other than me in this very thread, as many as NINE people per square meter ride the subway during rush hour in Sao Paulo, Brazil. Ergo, as many as 90,000 people could be squeezed into that space, if it were necessary. You're suggesting a grand total that is only one-ninth that amount, and not even at the same time.
You want to maintain that unarmed people in a space that size surrounded by armed SS would constitute some kind of problem? If that's the case, then what country in its right mind would allow public demonstrations of any kind, ever?
Please tell me where above you think my argument falls apart. Thanks.