Blogging for discussion?

I blog to participate in an on-going discussion about the future of education. I blog because I want feedback, criticism, and just plain interaction. Apparently some do not. Several times now I have tried to comment on posts at Schools Matter only to find that my comments have been denied by the moderator. I am not posting anything inflammatory or derogatory. My views simply do not conform to the seemingly desired echo affect of the "Amen!" crowd. Which is to say that my comments are critical of what is being argued in the post. Below is a transcript of the comment I left for the linked posting above.

The author of Schools Matter seems to have a chip on his shoulder about charter schools in general and makes sweeping statements about their illegitimate role in education. You can read the original post yourself and decide if my comments were not fit to be published on the blog.

You need to do more research about public charters before you broadly
condemn them across the board. While some are "workhouses" with
"mindless parrot learning" others are created to allow teachers MORE
creativity and innovation. Not all of them are forged from the KIPP
model. I know because I work for one.

I'll be the first to admit its lack of library facilities is
disturbing, but how long until a physical library is extinct or
unimportant when the school has a computer lab and access to vast
online resources?

Yes, the lack of collective bargaining and tenure can mean higher
teacher turn over and less regimented pay scales, however, it also
means that bad teachers can't avoid scrutiny and remain shielded by
tenure.

And finally, you say that charters mean cutting teacher pay but my
base pay scale (minus merit pay) is still higher than my colleagues
working in the public school district of which we are a part.

Who is being hurt when 100% of our graduates are accepted to college?
Our school is a public charter (we accept anyone) that is tuition
free. It is a school of choice, meaning students and parents choose to
attend and have other viable options from within the district. Charter
does not have to equal the end of public education, in fact, it can
easily coexist along side it. If innovation breeds change for the
better, why fight it?

Too harsh? Too critical? Why have a discussion if you want to stifle dissent?