Why the lying?
Kamprad was adjacent to Nysvenska rörelsen, a lifelong friend of it's founder Per Engdahl, who also supplied the initial funding for IKEA.
It's insane to claim that Olof Palme caused a shift away from parliamentary reformism.
And no, we've never had anyone pay "more than 100% in taxes". That's a myth, based on Astrid Lindgrens pretty weird propaganda story about it.
The antagonism between labour and capital is inherent, and you either apply force to subdue the exploited party to this conflict, or you negotiate a deal or parliamentary decision. The latter was the core of Saltsjöbadsavtalet, the reformist position represented by the trade union confederation and the Social Democrats. The radical position would be to form militias and engage in militant revolutionary activities, something which the strong reformist movement managed to guard us from.
The right and the fascists didn't think that was enough, however.
It's absurd to blame the victims of fascism for the rise of fascism instead of those who gain from it.
As for the reasoning behind the löntagarfonder, it's quite obviously immoral for people to become rich and powerful by disenfranchising and exploiting other people. Which is how late modern corporations work, you have owners that take the value produced by other people for themselves. The right agrees that this is a correct description, which is why they made sure pensions and wages have been invested in stock markets and investment funds, so every worker is now forced to participate in the casino.
You could disagree with the particular construct of löntagarfonder, but you would need to be very religious to claim that nature or some god made it good and right that the rich get to keep generational wealth and persist in disenfranchisement and exploitation of other people. It's close to the idea of divine right of kings.