Well theoretically if you had the processing power to attack bitcoin, couldn't you just attack litecoin, and change the rules around including bitcoin hashes, or whatetever, before attacking bitcoin ?
No, because SHA256 and scrypt don't use the same asic hardware, so to have 51% power in both would be near illogical, if not impossible.
That makes no sense. To get 51% of the hashrate in Litecoin is relatively Very Cheap to get 51% hashrate in Bitcoin.
Scrypt and SHA256 are very similar, I don't know what world youre living in fryarminer.