Most HN users could figure out how to safely blow up ATMs, few could figure out the other thing.

I doubt it.

I think most HN users would be above-average successful at white-collar crimes, especially if those involve technology.

I see no reason for any correlation between HN readership and aptitude for blue-collar crimes.

Anyone capable of stopping to think for 5 minutes will be above average aptitude for blue-collar crimes.

I think if all of HN tried it, a third would be in jail, and a third would need to be scraped off the pavement with a mop.

Maybe sucess chance is higher than with crypto, but the faiure is much worse

I would bet that the amount of people that need to be scraped off the pavement would be much less than a third.

The kind of explosives you would normally use for this are not difficult to handle or deploy, anyone with access to google can figure it out.

I think HN users in general would be much more inclined to do at least a little bit of research, unlike most blue collar criminals.