Some parallels, yes. With respect, though, there is a world of difference between the two events and how they were responded to. Yes, the H'boro families were shafted by legal and political chicanery that required a campaign to put matters right and bring justice. However, in the case of the Bloody Sunday families they had the whole of the British state apparatus with the connivance of a hostile British media establishment (and - shamefully - a hostile uncaring British public, save for people on the left and a few well meaning liberals) arrayed against them, and their campaign was viewed and skewed through the prism of an ongoing murderous civil war and the aftermath of that. I dont want to be weighing up injustice and and rights to feel aggrieved here and declaring one to be greater than the other, but the H'boro families never had that to put up with. Their loss was huge enough, of course. But their cause was always seen as justified and noble and supportable, outside of one newspaper, a few bent coppers and some senior politicians. In fact, I'd compare the Bloody Sunday campaign more precisely with the ongoing Orgreave campaign. The striking miners were similarly traduced and have had to be seen through the lens of a failing workers movement who were presented as a danger to the system....though, of course, there was no loss of life on the day(s).