I think I lost interest in debates because I was kind of sick of saying the same thing over and over. At a certain point, trying to convince something that is based on an ideology that they don't believe in is really impossible.
For instance, someone might take away my pen and I ask for it back, they say 'no' and I say 'that's not fair'. Now, if they say, 'life isn't fair' then they are actually, at some point, agreeing with my ideological statement that life ought to be 'fair' and can so I can say something like 'no, it isn't always fair, but that's something that we both strive for and you are able to best off giving me my pen back if you want to promote its existence.'
But if they were to say 'it's stupid to be fair', they're kind of arguing outside my own ideological reasoning, and then there is really nothing you can do.
The only debates that can ever come to some kind of resolution (though not necessarily the most interesting debates) is if the people are arguing within the same ideology. Another example: 'We shouldn't use preferential voting, everyone should only tick one box and whoever gets the most, wins.' This can come to some kind of conclusion assuming that both parties are arguing about which system is most fair/democratic/amusing/whatever, but it totally wouldn't work if one party was arguing for something on the basis that one system was fair, and the other party was arguing on the basis that the other system would help create a dictatorship.
I think ideologies are sometimes almost a kind of 'first philosophy' for people, because they assume the ideology through all their opinions and such, but if we ask ourselves 'why is democracy so great?' 'why is freedom so great?', etc., ultimately, we're just appealing to the ideology itself rather than anything beyond it. Freedom is good because I don't believe people should be imprisoned, democracy is so great because I think peach person should have an equal say in how the country is run, and so on.