Some rules which collectives can impose on individuals actually increase the freedom of the individual - such as banning the initiation of force against them. But collectivist states generally go way beyond providing freedoms, and actively seek to take them away, sometimes 'for the common good', sometimes because the collective 'knows what's best', and sometimes even 'for the good of society'.
When the collectivist state makes the decisions about how a human should live, they take away the essence of humanity from their people.
The essence of humanity is man's ability to make decisions. Not just to follow a genetic program, or to be trained to perform tasks like a circus monkey or an obedient dog. The essence of humanity is man's free choice. The ability to observe, to reason, and to make decisions which may improve his life and the life of his family. The cost of this is that sometimes he makes bad decisions which make him worse-off. That is also part of humanity.
The collectivist state makes decisions for him. Assures him he will be better off if he follows the wisdom of the experts, the wisdom of his leaders, or the collective wisdom of the masses. It enslaves him, and seeks to make him less than human.
The collectivist state is not your friend.