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How to add RSS feed from feedburner.com to Thunderbird

I found out that Google has a Security Blog and I would like to add the RSS Feed to the list of my favourite RSS feed on Thunderbird:

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Unfortunately feedburner.com offers a strange list of RSS feed: My Yahoo, freedly, netvibes, SubToMe, RSSOwl, NewsFire, etc… None of those look like a raw XML feed to me.

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I see someone already faced this problem here https://stackoverflow.com/questions/4687042/getting-raw-xml-data-from-a-feedburner-rss-feed . The hack

view-source:http://feeds.feedburner.com/GoogleOnlineSecurityBlog

truly shows an XML page but I cannot paste it to Thunderbird.

Why an old and basic technology like the RSS feed have to become so complicated? And is there any solution to this problem?

Is feedburner.com actively denying users to extrapolate the raw XML feed for some purpose? I don’t get it.