So basically you're more worried that some scumbags in France are making a quick buck by exploiting the refugees than about the refugee's rights to asylum?
Yes. These scumbags will just send more people over if they can make money doing so, and the problem becomes more serious.

You seem to be more concerned about the safety of a boatload of people, rather than the safety of several boatloads of people.

What if someone in Switzerland mugs a refugee and takes his wallet? Should we refuse that refugee then on the grounds that we're stopping crime?
Fucking hell, worst analogy ever.

Not how it works. A person crossing on a dinghy getting picked up on the beach by the coast guard is not stopping someone else coming across on a ferry. It's not a zero-sum game.
It's not literally how it works, we're don't have a strict limit that goes up and down for every migrant that enters and leaves. But when we talk of thousands, it becomes a different story. That is impacting on the ability of others to come here.