There was more security there than there has ever been during any of the terrorist attacks in Europe - total waste of police time. During the London, Brussels, Paris, etc., bombings etc., there was usually NO visible increased security whatsoever at most (all?) British transport hubs. That shows the real priorities of the authorities who are supposed to be protecting US. Meanwhile there was yet another fatal stabbing at Parsons Green due to TM‡ withdrawing 'stop and search.'
Can you please quote the statistics/evidence, or are all of your sweeping statements based purely on fantasy? Regardless of my views on the royal family, I think high profile targets, be they people or places are worth protecting. Don't forget they have lost one of their family members at the hands of the IRA, so clear evidence exists that they are a target.
How do you know the police would've stopped and searched the perpetrators of the Parson's Green stabbing prior to that event? Do you have a crystal ball?