A majority of people living in Poland don't like or support the Warsaw 11/11
A majority of people living in Poland do not care much about anything else but their own quiet lives. They do not vote and are ignorant of anything political.
To use it as if that fact would indicate that the march is popular only with a fringe of society is misleading to say the least.
I would say that a large chunk of those who bother to vote or are interest in politicks are supportive of the march in a one form or the other. Much more have nothing against it.
Sure, those who actively participate in organizing of the march as well as those who just vote on organization and societies that are behind that march are not that numerous by any stretch of imagination. They constitute about 2% of the whole. However those who support them less directly or have nothing against the march are much more numerous - I would say about 30-40%.
Also I don't see 2% as something insigficant, after all those who started the American Revolution weren't that numerus and had not enjoyed a popular support from the very beginning.