This cannot be reconciled with the meaning of the slogan "from the river to the sea". (Wikipedia claims that the slogan is used by both sides of the conflict, citing a JSTOR article I can't access; but I have only ever seen it used by Hamas and their supporters.)
Per Wikipedia, Hamas does not recognize Israel as of their most recent 2017 charter, and "called for a Palestinian state on all of Mandatory Palestine" in 1988.
While I'm sure that many Palestinians do not support Hamas and desire to co-exist with Israel, I see no good reason to suppose that this is any more common than the other way around.
> Israel is unwilling to have a two state solution, they always desired all of Mandatory Palestine
There is ample evidence to contradict this — enough that I can look it up on the fly. Were it true, for example, the Knesset would have had no need to pass a resolution declaring this to be their current position, barely a year ago. Netanyahu also claimed in 2015 to want a two-state solution, and of course there are other Israeli political parties with warmer attitudes towards Palestine.