So even if you keep your own coins secure, there is still a danger of theft performed with violence. You have heard of people who were forced to give up their coins/keys under duress.
Does this mean that multisig is a must?
if you have a couple of thousands bitcoin and you publicly announce it you might get mugged. but robbers don't know what bitcoin is or who has what to target them.
how can a robber know that you have bitcoin to target you and force you to reveal your keys?!