We also have e.g.:
When it comes to Jewish settlements in the West Bank, 40% of the public say they help Israeli national security, while 35% say they hurt. An additional 21% think settlements don’t make much difference to the country’s security.
Plus there's the fact that the country, despite all its internal divisions, managed to put a certain Benjamin Netanyahu -- who has declared the expansion of the settlements to be a "top priority" -- in office 3 times (for some 17 years total so far). And all the mainstream society hate for Oslo and 2SS, and so on.
These are just a few of many obvious indicators. Of course many feel conflicted about the settlements, and only support them the perceived "security" advantages, and so on. But it's just not tenable to say that the settlements "don't really have mainstream support".
When by all indications, the imperative to support and maintain them has been national consensus for several decades now.