Agreeing with someone else's opinion in many cases can mean that you have done something wrong or in vain all your life. It is difficult to accept, even when you have been doing some kind of heresy, for example, a year. And here is the whole life. If the arguments against your position are serious, sometimes it's easier to close your eyes and continue to defend your own, it's easier for the psyche.
And because he understands that a different opinion will be practically a different religion with a different belief system. You are young, and you don't yet realize it.
Belief in science, belief in the state, belief in humanity, belief in progress, belief in civil society, belief in communism, belief in democracy, belief in law and order , faith in technocracy, faith in justice, faith in a higher reason, faith in a categorical imperative, faith in life, faith in evolution ...
There are many faiths, but there is only one person, you can, of course, change his outlook, some way, four times, for example, Sri Aurobindo, but usually a person is limited to a maximum of one or two religions, unless, of course, he is an active seeker of truth.
And more. In actual fact, a different opinion is practically the same opinion, only dressed in different ideological clothes. Why accept a different opinion if it is tantamount to the existing one? Why scatter your consciousness with attempts to understand "the truth as a whole" when you can slowly and correctly move towards the whole by knowing even "one piece of truth"? Is that right?
There is no point in drastically changing your mind, especially when you realize that there is nothing new, and also nothing old :).
People of the older generation were brought up, roughly speaking, according to the laws of the 20th century, and their morals will clearly differ from ours, if nanotechnology fell on our youth, then books on their youth. + it will not always be easy for a person over 60 to re-educate himself under the "new world", the property will agree with your idea.