Ok Kiklo - let's dance.
That is true for any 'refundable' time locked txn, like Atomic Cross Chain Transfers.
If I can stop you from claiming the coins before the time lock expires, i can refund them back to myself (after I have taken your coins aswell that is).. Just have to prevent your TXN from getting on chain.
This is much harder to do than I think you are implying.
Hard for you & me , yes it is.
This I agree with
As easy as mounting a 51% attack !? yeah - real easy.. (And this attack applies to EVERYTHING crypto-coin based - not just LN)
Nah.. Let's say I want to cash out $100. All I need to do is pay a fee higher than the LOWEST the spammer pays.. Sooo.. If I'm prepared to pay $1, the spammer would have to spam the network, with fees OVER $1 for 100's / 1000's of TXNS to prevent mine from getting on.. no way is that worth it.
Nope.. AT NO STAGE am I having to TRUST the LN node to sign anything on my behalf. All the clever crypto-shit is done by the client, on his machine, and he certainly isn't going to sign a txn that has 'funny' timelock schedules.. The worst the hackers can do is force me to cash out, if the LN node starts spewing rubbish.
Anyone that reads the LN Whitepaper , can see stealing BTC from LN, requires nothing more than evading their time locks.
That is true for any 'refundable' time locked txn, like Atomic Cross Chain Transfers.
If I can stop you from claiming the coins before the time lock expires, i can refund them back to myself (after I have taken your coins aswell that is).. Just have to prevent your TXN from getting on chain.
This is much harder to do than I think you are implying.
Hard for you & me , yes it is.
This I agree with
But the rich guys that can collude to 51% attack.. it is easy as pie.
As easy as mounting a 51% attack !? yeah - real easy.. (And this attack applies to EVERYTHING crypto-coin based - not just LN)
..the rich guys that can spam the network until your timelocks expire, it is easy as pie.
Nah.. Let's say I want to cash out $100. All I need to do is pay a fee higher than the LOWEST the spammer pays.. Sooo.. If I'm prepared to pay $1, the spammer would have to spam the network, with fees OVER $1 for 100's / 1000's of TXNS to prevent mine from getting on.. no way is that worth it.
* The only poor people able to pull it off , are the Hackers that learn to Hack the LN Nodes, and modify the timelocks ahead of schedule.* 
Nope.. AT NO STAGE am I having to TRUST the LN node to sign anything on my behalf. All the clever crypto-shit is done by the client, on his machine, and he certainly isn't going to sign a txn that has 'funny' timelock schedules.. The worst the hackers can do is force me to cash out, if the LN node starts spewing rubbish.