If we burn all the coal, it will release more carbon than every other source that is likely to be liberated through feedbacks. So, yes, we can and are making it worse. See particularly the last pie chart.
(double click and choose 'view image' if you can't see the whole thing)
Also, while we know a lot more and with a lot more certainty than denialists will admit, the fact is that we don't and can't know everything. There may, if fact, be some unknown unknown damping ('negative') feedback that could kick in and save our worthless a$$e$, but perhaps only if we have not pushed the system too far. Do I think that likely? No. Is it absolutely impossible. It would be unscientific to answer yes to that, it seems to me.
But thinking that there is nothing we can do now to make it any worse so let's just keep on doing what we're doing, or even more so as we start checking off our bucket list...
Ultimately, though, it's kind of a moral question. If you have been kicking your grandma in the face with steel toed boots, then suddenly realize what you have been doing...even if you see that there is probably no way she will survive much longer, do you go back to kicking her in the face as hard if not harder than before?
Apparently some do seem to choose this course.
My 'high moral stand' is to kick at least somewhat less hard (since modern society pretty much prevents us from kicking all together). So to be clear, I don't think there is anything like any sort of 'path of virtue' here. Just more, or less, intense obscenely immoral behavior. I just (inconsistently) try to angle a bit more toward the 'less' side than some here, apparently. But few people that I know of even care to think about it, so thank for the frank discussion, at least.