College Instructors Vote to Strike

Earlier this year, community college instructors voted to unionize,  a right they were afforded following a recommendation of Kevin Whitaker (Chair of the OLRB) in 2008, who had been asked to review and make recommendations for revising the Colleges Collective Bargaining Act.  This week, the instructors voted to strike. This does not mean there will be a strike, of course, it just means that if no deal is reached, the union has satisfied the requirement to conduct a strike vote, which is a condition of conducting a lawful strike.  For those of us at York, there is a possibility of picket lines at the Seneca College campus, which could disrupt those people who drive in past the Seneca Buildings.  But all of that is speculative right now.  We will keep an eye on this bargaining.
It’s interesting that college instructors were only recently given the right to strike, whereas university professors and high school teachers have long had this right.  Why do you think the law distinguished between college instructors and other instructors?