Sort of unreasonable, really. I'm sure the Palestinians would be more than gracious if they ever achieved significant power.
I sympathize with the desire for a Jewish state but the United States has supported them to the hilt in human rights abuses, war crimes and expansionism that aren't related to that goal.
Ignoring the recent shenanigans, the Russians are a non-issue and the Israelis aren't much helping with that anyway. I have no idea why support continues. It's difficult to formulate an explanation that doesn't come off as whackjob conspiracy-theorist.
As for a "two-state solution"... it was never much of a solution for the Israelis. The other state soon outnumbers them, and they're right back to where they were in the 1960s, but with fewer options and less advantage. Same but for details with a one-state solution. If they ever pretended to accept the two-state solution, it was only to string things along as much as possible. I'm not sure why anyone ever thought it was genuine.