I used to think that as well. The problem is that if you don't have an arbitrary employment security clause (seniority, aka LIFO), employers can find ways to f

I used to think that as well. The problem is that if you don't have an arbitrary employment security clause (seniority, aka LIFO), employers can find ways to fire you/lay you off arbitrarily for union activity under the cover of other reasons (e.g. unrealistic performance goals). I don't know how to resolve this problem. But without LIFO, you can be guaranteed that most people who use the union for its intended purpose doesn't have much of a future at the company.