There are various methods and ways to answer your question.
To list the reasons for each speaker is not preferred by me.
I will state a few basic rules, then list a host of reasons that formed the cause of my rulings.
1.) There is generally no spiritual benefit in listening to lecturers who are fusaaq and fujaar.
2.) There will come a time when Ahle Haqq will be regarded as Ahle Baatil.
3.) There will come a time when Ahle Baatil will be considered Ahle Haqq.
4.) Mainstream Islaam will be regarded as the ‘exception’.
5.) The ‘exception’ will be regarded as mainstream Islaam.
6.) Due to Ahle Baatil having the media propagate their corrupt views, it is considered Haqq.
7.) Because some so-called ‘prominent’ Ulema do certain actions the masses think that it is part of mainstream Islaam.
8.) This ‘diluted’ Islaam is spreading in South Africa, driven by just a few corrupt Ulema in important positions. In a few years, we are going to have a new version of Islaam, which the masses will think is mainstream, divine, pristine and pure Islaam.
9.) Because of lack of Islaamic Ilm and Taqwa, halaal will be classified as haraam.
10.) Haraam will be classified as halaal.
11.) Many times an Alim starts of good but for want of monetary gains and market share in popularity they compromise the Haqq.
12.) Many times an Aalim is good, but becomes corrupt, due to association with the evil or not being able to withstand the environment of Baatil.
13.) At times an Aalim strays from the correct way, by expressing weird views in order to be counted and witnessed.
14.) Under the new slogan ‘let us agree to disagree’ and ‘let us accommodate each other’, Haqq is mixed with Baatil to such an extent that a layman cannot make out the difference.
15.) Historically, analyzing orators and dynamic speakers fabricate stories and at times go over board presenting wrong concepts and ideologies;
16.) Point 15 leads to a paradox, thus the non-Alim cannot separate the grain from the shaft or wood from the trees – thus avoid.
17.) One has to rule with Imaam and Islaam as priority so that it can be protected.
18.) Most of the time we listen to dynamic speakers, firing on all cylinders, but they have no effect on the listener; this is because the speaker does not practice what he preaches.
19.) Most of these lecturers do not say even one word against deviated groups, beliefs or acts; they do not want to upset the apple cart.
20.) The ruling we stated in very light.
21.) The reasons listed are by no means all inclusive and every one of the lecturers are not guilty of all but are guilty of many reasons that are listed.
22.) Do not listen to any lecturer from any deviated group.
23.) You may listen to those lecturers who have been classified as knowledgeable, pious and good – but if they, no matter who or what standing they have, ask you to do an act that is not substantiated in Sharia, do not do it.
1.) Some have legalized photography.
2.) Some have legalized videoing.
3.) Some have legalized appearing on television and sending a signal that there is absolutely nothing wrong in doing so.
4.) Some get interviewed on television by females.
5.) Most do not observe the laws of Hijaab.
6.) Most shake hands with non-Mahram females in public repeatedly.
7.) Most pose with females for group photographers.
8.) Most attend and promote un-Islaamic functions and gatherings.
9.) Some are anti-Talqeed.
10.) Some speak ill of the Salf-Salaheen (pious predecessors).
11.) Some regard 3 Talaaqs issued in one sitting as one.
12.) Some regard 20 Rakaats Taraweeh as ‘not proven’.
13.) Some border on Kufr, by accepting and even promoting the ‘Muslim Marriage Bill’.
14.) Most consider commercially cut chickens as Halaal.
15.) Many are ‘scholars for dollars’.
16.) Most approve of the Haraam, so-called ‘Islaamic banks’ and ‘Muslim schools’.
17.) Some make ‘Tafseer bir Rai (Self-opinionated Tafseer)’.
18.) Some participate in functions of Kufr, Shism and Bid’at.
19.) Most preach one type of Islaam when in South Africa, but when they go out of the country, all rules are changed and something else appears.
20.) Most project themselves instead of Islaam.
21.) Many make rude, crude, and embarrassing jokes.
22.) Many do not bother to make Salaat with Jamaat when they go outside of South Africa.
23.) Many agree to participate in inter-faith seminars where it is understood that ‘all religions are equal’.
The above article will serve as a guideline to assess every lecturer.