I personally think Harry ought to have all the security he's after.
If anything profoundly negative DOES unfortunately occur to either him, his wife or children it will reflect very badly on we the British people. I admittedly do not know all the details - anyone feel free to correct me - but my understanding was he had it before he got married and then when he left the country, it was taken away. It does seem somewhat of a bid to send a message of 'you cannot have that and this' I can't imagine if he had married more appropriately and agreeably and had relocated under a cloud of goodwill to somewhere like Botswana that his top level security would have been taken away.
Now imagine a scenario where something happens solely to Harry and Meghan goes on the publicity touring warpath. She's already proven herself to be litigious. Just imagine anything happens and all the anti-royal Meghan stans out there. It would very bad for the Monarchy indeed, especially as we draw closer to America with their Republican sentiments.
Talk about saving money but are the Royals as a whole value for money in any real respect? Some would say they could sell off a few of the empty properties they have hanging around just to start with and they'd still not be trimming back. So I hardly think the money is the true concern. I think that's a smokescreen argument.
The fall out from Diana was bad enough. After the racism claims and the Andrew debacle, one more major scandal and that it could well be the end of the Royals.
I think paying for his security is a small price for him to shut up and go away and get on with it, and averting future problems.