I support the OP. In my view this stunt did amount to desecration, never mind if wreaths were trodden on or deftly avoided. Whether one supports the ideals of those involved or not, they were wrong to promote them on that date and at that place. The Cenotaph means so much to those who've lost those to whom it is dedicated. It means less or nothing to those who have used it over the years to express their protests or anger, against whom or whatever. There is a growing tendency these days to demand one's own rights, including an ever widening interpretation of what is 'free speech', rather than a consideration of the rights of others.
In wearing his uniform to conduct this act of desecration this ex soldier brought shame upon it as well as himself. Single item agenda lists always skew any resultant acts towards the disproportionate and inappropriate. This act was completely inappropriate and unjustified.