A ‘warm-up’ for the marching season

SDLP MLA John Dallat’s description of the on-going loyalist campaign in Garvagh against catholics; The Daily Ireland has more details of the Ballymena attack and catalogues similar incidents in Ballymena in the past year, which occurred during the height of the marching season.
With both nationalist parties identifying the loyalist marching season as the spark for sectarian tensions and attacks across the north, are there unionists/ loyalists who accept this line, or have they a counter-thesis to explain the pattern of sectarian behaviour?