We live in a society where ambulance drivers and firemen routinely have bricks and bottles thrown at them, nurses are spat at and punched, teachers kicked and stabbed. This is just the state of the UK after 40+ years of right-wing rule, inequality, underfunding and division, and it is only getting worse. These moderately paid public sector workers will not be getting bodyguards.
Again it appears (thankfully) that David Amess was not killed for his political beliefs. This was not an enraged LGBT or disabled person reacting to his voting record, his party’s corruption, xenophobia etc. This appears to have been an Islamist extremist looking for someone to murder, because that’s just what these brainwashed shitheads do. If it hadn’t been the MP it would likely have been the vicar, church warden or some other equally innocent victim. You can’t protect everyone from this sort of irrational random threat.
PS It absolutely repulses me that so many are attempting a political land-grab from an admittedly awful situation. The reality is this is a terribly sad event where a religious extremist killed a man. This has happened previously. It will no doubt happen again.