From an individual self preservation perspective I agree, but for the good of humanity we need some people to stand up and say No. The thought of getting a rightfully deserved kicking might just be enough to deter the average opportunist scumbag. If everybody just 'let them go' then there would be no barrier to entry in the thievery profession and we'd have a lot more thefts.
EDIT Just seen you're from SA where the chance of getting killed whilst resisting is very real, so YMMV on this.
Last time I was in Joburg there were two conversations I had with locals that stuck with me; one where a friend told me he'd just had a stairwell cage installed at home, so when (not if) his house got robbed at night, he hoped the thieves would just take the stuff and not kill his family. The second was a colleague who said crime in Joburg isn't so bad, I've only been carjacked once.