Why do you generally issue 30-day no cause notices? (Oregon)

[Ellie Narie]

I'm curious, what are some of the reasons you decided to go with issuing a 30-day no cause notice in the state of Oregon (in the first year of someone's tenancy)? 

I have a problematic tenant who has lease violations, but I'm not sure how to go about providing adequate proof to the courts for an eviction. 

Would it be easier to issue a 30-day no cause notice? At least with a 30-day notice, there's nothing to prove, no issue or hassle. I've never evicted anyone before, and only bought this property a year ago.