Your whole premise is based on this vague notion that this forum does not welcome every sincere who wish to learn more about Islaam. What you're advocating is a discussion group where we discuss and debate with the people who do not adhere to the way of Ahlus Sunnah (such as the Raafis,Qadianis, etc).
In addition, you're holding this perception that we are harsh against individuals who belong to certain groups and sects and for that I have never come across a statement from the staff of this forum where we banned members because they belonged to a different group. Rather, we do not wish to engage in to sectarian discussions and have opened a separate section for that lest fitnah should arise. If you're filled with motivation to engage in sectarian talks, then there are plenty of forums where they allow this type of discussions.
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One should understand that this is a forum based on the adherence of the way of Ahlus Sunnah Wal Jammah which is the creed of the companions, their successors and their followers' followers, the four imaams and those who followed them exactly in faith. We do not affliate with any ahzaab, sect, groups or ideologies. Your frustration lies in with the ghulaat who masquerade with the affiliation with the maddhab of the salaf such as salafipublications.
The problem with the lack of unity in the contempary world is due the gross lack of understanding of what Allaah (Exalted is He) has commanded the believers.
Allaah (Exalted is He) did not use the word 'unite' in the aayah:
"And hold fast to the Rope of Allaah and do not be divided", he uses the word 'hold fast' as in clinging to an object which is our 'Aqeedah. Once we hold fast to the 'Aqeedah of Ahlul Sunnah, we can come together and unite. And hence, we are trying to instill the correct 'Aqeedah and fundamentals of this Deen so that the believers are united.