And there goes freedom.

By this definition, any law destroys freedom. Every nation on the planet already operates on the premise that certain personal freedoms are regulated or restricted for the sake of societal harmony and progress. The "slippery slope" arguments either ignore the fact that we already make the same compromises all the time, or assumes all such compromise is wrong, which is a viewpoint that is so unrealistic or extreme that, at best, will never ever have support from more than a sliver of the population and will never be realized.

Well, we also don't have the freedom to murder or steal (and numerous others besides, like letting our dog crap all over the street, employ child labor, even if "consensual", and so on) So there's that.

Sure, people are free to want anything. Acting on their wants may be another thing.

Then they're not free to operate as they please.

Oh dear - no, strictly speaking, they are not. Nobody is.