So you'll end up taking a different route, most likely without you even noticing. You aren't forced to route through people with insufficient funds.
My point is that there simply might not be a route with enough funding.
But if someone does attempt to defraud you and you catch them, you can take their funds. That's a rather strong disincentive to try ripping people off.
It is. But you're never 100% sure, which means that you actively NEED to monitor all of your channels for fraud. That's really a big downside.
Which is why Lightning is completely optional and you can still send regular payments to be confirmed directly on the blockchain, just like you always have done.
This is no argument at all.
I don't see how any of these will result in LN "failing".
These are some serious problems with LN which will most certainly ensure this will never become a big success.