In order to argue that it's sensible, you have to first demonstrate a disimprovement in affairs warranting a change in policy, and secondly show a causal link between "outsiders" that your border control is targeting and those disimprovements.
Even if you could manage the former of those two (which I don't believe you could, though I might be mistaken), the latter is definitely not the case.
I don't have any numbers, but I twice saw refugees "caught" at Malmö Hyllie station; the first station in Sweden and the official customs point for people arriving by train from Denmark.
I only go to Malmö every 2-3 months, so at least for a while it may have been reasonable, given the aim of discovering refugees before they settle illegally somewhere.
I've been to Sweden twice in my life, and I've hit these border checks three times (I believe they were the first country to bring this stuff in—about 5 other countries have done so since) and also seen the same happen on one occasion coming from Copenhagen (by bus); someone being "caught". Nothing about that indicates to me that this is warranted, effective, or not purely motivated by paranoia. Who were those that were "caught" in your encounters? Did you get their names?
In order to argue that it's sensible, you have to first demonstrate a disimprovement in affairs warranting a change in policy, and secondly show a causal link between "outsiders" that your border control is targeting and those disimprovements.
Even if you could manage the former of those two (which I don't believe you could, though I might be mistaken), the latter is definitely not the case.