I don't think that this is a symetric situation in the sense that on the 'other side' there are just as many legitimate objections against liberalism.
Trying to be reasonable and look at things from more than one angle is ofcourse a very good thing.
But that would mean for instance that you could say something like: "well stalin killed around 25 million people but if we look at it from stalins point of view that was perfectly legitimate" and then eventually saying that people against staling and in favor of him both have good points so a good compromise would have been not to kill 25 million people but only 12.5 million.
Let's not do the abortion discussion here, but from all the other points it's perfectly clear that it just means that accepting people are different and that people who're different than most of us also deserve to live in this world.
There is no way that accepting people are homosexual, muslim, atheist, palestinian or from a non-western culture could be a thread to the family, christianity, america or western civilization as a whole or the state of israel.
How could this be a thread?
You mean that once you would accept that homosexuality is not a form of satan-worshipping, that would immediately turn you and everyone you know into a homosexual?
That implies that you are secretly homosexual because you find being homosexual actually a more atracting perspective than being heterosexual.
How else could it be a thread?
If you believe accepting muslims as equal to christians is a thread to christianity, then you somehow must believe that most people actually rather would want to be muslim than christian.
How else could it be a thread?
Besides.
I don't hear liberals say that conservatives should deserve the death penalty.
President obama already received more death-threats then the bush administration.
While if you want to compare anyone to hitler, the bush administration would be the most apropriate for this: who invaded a country that posed no thread to the USA or any of it's allies? who lied to the public about the invading of a country that was no thread to the USA or any of it's allies? who sent many people to illegal prisons without any trial? who encouraged the torturing of prisoners?
They, the ones responsible for all the above, actually dare to compare obama, who hasn't done any of this, to hitler.
That's how asymetric the situation actualy is.