the other problem with the way you are thinking about it is the asymmetry

are you saying that proportional force would be such as finding this person and taking something from them of equal value?

let's say said thief did this by stealth, and caught you by surprise and pulled the watch off you, and then runs off, and they were dressed in generic clothes and had a mask on, and you were unable to catch them

there is a big asymmetry here, justice cannot be served at all, unless someone happens to report they were offered this item and somehow they knew it was stolen, and this is highly specious because most likely the next person who takes possession of this rolex is a fence who knows what he receives was stolen

so, then, thief gets their cut, and fence finds another corrupt scumbag to retail the rolex, and takes their cut

some stupid person who doesn't care if item is stolen or not, buys it and the circle is closed

who is now responsible for not stopping this chain of profit at the loss of one person?

the person, for not shooting at the thief when they had the chance

instead, multiple people have profited at this loss and none of them are going to get any justice at all

how do you propose proportional justice is going to work at all if it doesn't even attempt to stop this chain of corruption, exactly?

sure, probably not right to shoot someone dead for entering your property, but if they refuse to stop heading for your barn to rob you of your prime rooster or bull, then what? at what point is it proportional when not only have they trespassed, they have continued to ignore your warnings, they ignore a warning shot, then if you ask me, they have consented to being killed, and anyone who is willing to trespass and seeks to get away with it is looking to be six foot under, that is consent by action, which in this case is totally valid after at least one bullet hits the ground near them or over their head, they don't stop, they want to die

also, for this reason any opinion you have about dealing with such people, in the absence of experience, should be disregarded, and i question how you have the confidence to express it in the first place