OK....... here I cometh.... out of the old closet!
If a person wants to deliberately, maliciously, vindictively post a message intended to upset people, especially those who have lost sons, daughters, husbands, wives and loved ones through military action in service of their country, then I for one will not be laying in bed tonight, staring at the ceiling, wondering how long it might be before this sorry little soul might dare to show his face outside again.
(No Revoltingest.... I'm not going to tell you what I might be doing instead!)
He might not be charged with any offence, and arrest in England does not carry the consequences of, say, arrest in New York (much worse) but this did need to happen, so that other saddies will be deterred from malicious messages as much as possible.