No, that isn't paranoia - that understanding comes from decades of studying the tactics of disinformation and demoralization.
The Soviets referred to the overall implementation of these tactics as
"active measures".
There are still some good videos on YouTube of KGB defector Yuri Bezmenov being interviewed in the 1980's and giving presentations on what his job was, how the process works, and how the Soviets and their partners in foreign (hostile) lands implemented them.
-----------------------------
Firstly, the common teacher who is "teaching" such things is not some sort of "active conspirator" dedicated to harming or perverting the kids.
Rather he/she (not ironically soon to be banned words of "hate and exclusion" - that should set alarms off for people, but apparently not) are themselves indoctrinated "agents of change". The Soviets would refer to them as "useful idiots".
The teachers undergo training to implement these things and are taught to view themselves as "agents of change", while also being given training on how to deal with parents who object, the implication being that parents are not qualified, nor should they have the right, to impart this type of information to the child.
That responsibility and duty, these teachers are told, should only be exercised by qualified, trained professionals like themselves.
--------------------------------
As for premature sexualization - any rational, non-indoctrinated adult should be able to conclude that introducing young children to the subjects of sex, sexualization, sex acts, pedophilia, homosexuality, gender identity, etc., can only be psychologically harmful to the child.
From the perspective of the left - from the perspective of anyone seeking to destabilize a society - this would obviously be a useful longterm tactic.
If the goal is to overthrow the existing society, and with it it's system of government - and that is the goal - it should be obvious how effective this long range strategy would be.
Therefore, the intent of harm to the child is deliberate.
------------------------------
These psychological tactics and attacks became a standard part of training for the KGB.
Based on the work of Pavlov and later B.F. Skinner (behaviorism), these subversive tactics began to be implemented in the United States as early as the 1940's.
It is an enormous subject in and of itself.
---------------------------
So - to say that the goal of premature sexualization of children is to deliberately harm them - is not "paranoia".
It is stated from the position of having an indepth understanding of why this agenda is being pushed at all.