I think the question is if Snowden recklessly (i.e. without careful consideration of consequences) endangered the lives of <insert arbitrary people group here>.

Information is power. Snowden leaked damaging information about corruption in one of the most powerful and important surveillance groups. The public <replace with Russian, Chinese, child pornographers for emotional poignancy> has access to said damaging information.

The OP and the Times article are evaluating whether certain groups have 'privileged' access to the Snowden archive and that considerable harm has been done to British intelligence operations.

I think it's more damaging to not critically evaluate claims made by the Sunday Times article than to dismiss the HN discussion because of reverb in the echo chamber.