For people stating that they don't like the idea of a '2 person' rule - or who are uncomfortable with the extra person being a FA. Perhaps it is worth looking at the rest of the world - specifically at the USA where that IS the rule. How many pilot killings have been on US carriers operating that rule? It seems to be zero.
The '2 person rule' is not a perfect solution - that doesn't exist - but the evidence to date suggests that it is an important, simple and inexpensive precaution that appears to be largely effective. Which is presumably why it has been implemented (in true stable-door fashion) by many carriers in the last few days.