Such a stupid take:

• We know way less about submarines, especially non-military ones, so that we can get way more info from finding the cause of the failure with submarines compared to normal boats, especially as refugee boats often are very obviously overcrowded.
• There likely would be a way greater effort to save refugees if it didn’t mean them coming to Europe. Just from a monetary perspective, saving 300 refugees is probably more expensive than saving a handful of rich people in the long run.
• Even though it’s dangerous, it seems way less dangerous than the titanic drive. Here, the failure rate was 1 in 4, and by far not that many refugee boats sink