Wolf: Since the doer knows the Machmir Shitta, and chooses not to follow it, I can see a Rov saying it is a Maizid, since the doer should have known better.
Holding a more lenient opinion = being mechalel Shabbos B’Mayzid?! That’s quite a stretch there.
Do you hold of every machmir opinion in the world? If not, are you transgressing aveiros b’mayzid?
The Wolf