Question on freedom to voice support for criminal actions?

[Minimalist]

So you agree that it`s alright to have sex with a child?

In the US the First Amendment assures freedom of speech. However, advocating for something is not to be construed as approval for doing it.
IOW, you can say it....just don't do it.

It is what allows such reprehensible groups as these,

http://www.nambla.org/

http://americannaziparty.com/

http://catholics.org/

http://www.republicans.org/

http://home.nra.org/#/home

to have web sites.