Or are you arguing that a crazy PM is easier to deal with in a Parlee-alimentary Structured Government?

Precisely. Getting rid of a PM is pretty straightforward. Getting rid of a President is a lot harder.

Also, if a ceremonial Head of State goes crazy like Trump, it wouldn't really matter too much. Likely enough it wouldn't even be noticed, and if it was it'd probably be seen as just amusing, though some people would object to being embarrassed.