The law exists (UK law in this instance), its literally what Governs our behaviour. Like it or not, it exists and we as members of society must abide by the laws of the land in which we choose to reside.
Opinions also exist, we are all entitled to them no matter how outlandish other may view them.
Now, something being the law v often doesn't match my opinion, nor i would guess the majority opinion on the matter. For example - if a paedophile went near my child id 100% want to find them BEFORE the police did.
That however doesn't alter the fact that id be then charged with the crime of murder. Its just that id accept that as it would be my choice to ignore the law and handle it as i suspect most reasonable humans would.
My (rather laboured and waffling) point here being, its abundantly clear that both 'sides' here have broken the law. Its pretty much indisputable for either party to say otherwise. Therefore BOTH sides should face the individual consequences of that. To say otherwise is simply you offering your opinion, which is of course fine and may be something id agree with morally, but as explained its not the law, and to say that anyone who disagrees with your opinion is "an idiot" or as i've seen other comments in this thread, doesn't put anyone (the hypothetical poster) in a good light for believing that your/their opinion overrides the very law which gives you/their life in this country as you know it.
Therefore, given the above, id be surprised if a Judge reaches any outcome which doesn't involve seeing a custodial sentence for both 'sides'