I have witnessed the unfairness of the people who celebrate this first hand as i have been in that Jama'ah for over five years. I have even defended the milaad, amongst other things.
Alot of them do not do it for love of the Prophet sallahu alayhi wasallam. To them it's merely another excuse to attempt to takfir anybody who does not celebrate it. This can be seen by the sitting in their gatherings, where i have heard scholars "debunking" the "Wahaaaabi" arguments one by one, the crowd are like noooooreeeee takbiiiiiiiiiiiir - Allllaaaaaaaaaahhhhhuuuu Akkkkkkkbaaaaaar , nooooooreeeee Risaaaaalaaaat - Yaaaaaa Raaaaasuuulllulllllllaaaaaaah, and so forth.
So for most, it's just another day to beat their chest with the claim they are the right group.
However, there are those who sincerly love the Prophet sallah alayhi wasallam from amongst them. The signs of them are that they grow the beard. And i am not talking about the fashion beard, i am talking about the full sunnah. They just do not understand what is going off because their people make every attempt to mislead them.
They want the people to think that Salafis are anthromopists in their creed, that they do not love the Prophet salallahu alayhi wasallam, but in all fairness, i feel that Salafis have been made an unfair target, and it is the people of desire to be liked others that persecute Salafis, because the idea of following the Salaf is not at all fashionable.
I cannot defend Muhammad Ibn Abdul Wahhab, but neither can i condemn, but if he is in line with thee Ahlus Sunnah wal Jamaa'ah, which is the people of Sunnah and the majority of agreed upon scholars (not the biggest headcount of Muslims worldwide as some would have us believe), then, he is Ahl us Sunnah, and we can find this out by comparing his doctrine to that of the Salaf.
Only with fairness one will reach truth. If you do not know, do not condemn, seek ....