In my opinion this was an attack on the gardai more than any attempt to assault the marchers. If violent opposition to the marchers was their purpose then why not wait until the marchers were within range when real damage could be done.
These were just opportunistic scum who saw that they had the numbers to take on the gardai and terrorise ordinary people, this is proven by their subsequent actions of damaging property, looting, assaulting ordinary people and willingness to engage violently with the gardai.
We saw these fools last year on St Patricks day, we will see them again this year and any other occasion that they sense an opportunity.
However, the only thing I find embarrassing are those who start and then propagate the "embarassed to be Irish" crap. Are a couple of hundred scumbags representative of us, are we that stupid that when we see riots elsewhere that we think "oh everyone in that country must be really terrible people". Were these same people embarassed when our president decided to make statements abhorred by most Irish people and to indirectly condone the segregation and second class treatment of women.
What this was was a missed opportunity. There was trouble as predicted at the start of this thread and everywhere else except garda headquarters. Who wouldn't have liked to see the gardai deal ruthlessly and efficiently with these scum, even the gardai themselves know that this was an opportunity to administer (legally) the only kind of justice these scum understand. These are the scum who perpetrate crimes everyday against ordinary people and who never get sent to prison or don't care even if they are. To have an opporunity to get a decent amount of them in one place breaking the law and not respond appropriately is the real shame here.