we used to have rights

Such as innocent until proven guilty and the right to silence. The RIPA obligation to handover keys violates these 2 principles by obliging a suspect to cooperate in the collection of evidence for the purpose of their own prosecution.

The possibility that a few guilty people might be locked up on account of this who otherwise wouldn't be doesn't justify locking up otherwise innocent people who refuse to cooperate in this procedure. How long it will take a case of someone who is innocent and does not cooperate to get before the European Court of Human Rights based on violation of the ECHR (European Convention on Human Rights, section 8 right to privacy and section 6 right to a fair trial) is an open question.

This unstoppable modern inquisition...

What a strange thing that courts, police and governments should exercise quite so much punitive pressure on anyone for looking at mere photos, even to the point now, it seems, of forcing anyone accused of such an epoch-shattering crime to damn themselves for refusing to incriminate themselves.

Justice gets suspended for this crimen exceptum. Normal rules no longer apply - so we take away a person's right to not incriminate themselves and put them in prison anyway, safe in the knowledge that anyone going before a court charged with even looking at 'indecent' images stands virtually no chance of a fair outcome. You do know that, right? That it's not the prosecution that does the damage, but the mere accusation? That's what will ruin your life - that's how it's been intended, by police, courts and advocates, from the start. The prosecution is a mere formality - a necessary, if expensive, process, but not really the point.

You quite literally cannot win, once you become an Accused. The Maleificarum has stitched you up good. Confess and be damned - forever - or refuse to cooperate and be damned - forever - because the police know that the accusation IS the punishment and THAT's what will follow you around forever, while being forced to the sign the SoR is merely the Maleificarum's way of continuing to put it's boot into your face on a regular basis, just for the hell of it, while ensuring you remain jobless, homeless and socially excluded for the rest of your life. 'Rehabilitation'? That's just some people talking.

One hundred years from now, future generations will hold their heads in shame at such wretched, medieval standards of 'justice' practiced by allegedly liberal, progressive societies and perhaps the countless lives ruined by a willfully spiteful modern inquisition might at last find some measure of apology - too late for them, but perhaps enough of a warning for future generations. Perhaps.

For now, the moral panic knows no bounds - not even those of it's own laws. Front doors will be kicked down in the wee small hours by heavily armored policemen in full riot gear (and before the cameras of an invited press, no doubt) to catch these terrible, seemingly unstoppable threats to the very fabric of our apparently highly corruptible and entirely fragile society. No expense must be spared, no law too sacrosanct that it cannot be bent or broken to satiate the voracious appetite of this unstoppable modern inquisition.