negra orquida, you're getting more complicated now... anyway, your questions are valid as I'm sure many do have such concerns.
In my opinion, technically, when we eat/buy meat from wet markets/ shopping malls or processed meat from fastfood outlets like McD; 2nd and 3rd conditions are "safe" but the 1st condition is still in question.
Many argued that whether we buy or not, those animals will be slaughtered anyway so should consider as not specifically slaughter for us individually.
However since the animals are being slaughtered specifically to serve consumers/customers and we are consumers/customers, so the 1st condition still stay...Then again if we're to argue further, we can say that the real direct customers of slaughter house are the shops, malls, chain outlets etc. not the buyers who eat the meat
I would view these arguments as lame excuses for them to eat meat minus the guilt feelings. We can cheat ourselves that we are not 'guilty' for the killings yet we can't cheat our own karma.
As for the video, I don't think the 2nd and 3rd conditions are affected by this but I do think the videos should wake up our deep consciousness to avoid unnecessary killings for the sake of our selfish enjoyment.
The results of Karma for killing does include different factors such as
karma weight (heaviest like 5 heinous crime),
intelligent levels (understand pains and fear of pains),
sizes (sense consciousness),
karmic debt (people kind to us vs stranger), etc. So we can safely say that a buffalo will suffer more due to its mass and more developed sense consciousness compared to an ant.
Now, I am seem to be contradicting my own statement from my earlier post.
Contributing to killing indirectly, like in this case (by eating meat), as compare to taking the lives directly by spraying pesticide poison onto ants is definitely less in term of the karma weight.Actually I am not. Like I mentioned before, there is no hard and fast rule in Buddhism, we need to analysis case by case basis.
Bigger animal like buffalo suffers more than tiny little ants but we must not discount another factor here; when one acts or orders the killing of ants, one has stronger and specific motivation to want those ants die, whereas when one takes meat, one does not have the motivation to kill (except to fulfill one's own attachment to that specific taste).
So in this case, the 4 conditions of karma (for a complete karma) have to be taken into considerations;
1. Intention,
2. Object (the person/animal),
3. Action,
4. Completion and Rejoicing.
Thus when one has intention to kill, has the object = the ants, the action = killing, completion = the ants died and one rejoices in the killing, then it is a complete karma.