Some pieces of Buddhism:
1. Four Noble Truths:
-Suffering exists.
-Suffering has a beginning.
-Suffering has an ending.
-There is a way to end suffering.
How can anybody disagree with those?
2. A way to end suffering is the Eightfold Path:
-correct understanding (of everything)
-right intention (commitment to ending suffering)
-right speech (speak the truth, don't be abusive)
-right action (don't kill, don't steal, etc.)
-right livelihood (don't practice a trade that increases suffering)
-right effort (seek to stop your harmful thoughts, words, and actions)
-right mindfulness (be aware of what is happening now)
-right concentration (focusing on following all of the above)
These ideas overlap with each other, but how are they a problem for anybody?
3. Derived from the Eightfold Path, especially right conduct, are the Five Precepts (everybody is supposed to follow these, monastics have stricter rules):
-Don't kill.
-Don't lie.
-Don't steal.
-Don't get intoxicated.
-Don't misuse sex.
There is a lot of debate on all of these, since it is impossible to live while fulfilling all of them in the strictest sense. This connects to another Buddhist concept: The Middle Way, avoiding excesses both of self-indulgence and self-mortification.
In my experience of Buddhism, which is not at all representative, the details of applying the precepts are left to the practitioner. Think for yourself: What contributes to decreasing suffering? Sometimes that may mean killing in self-defense, or killing an animal to eat. Sometimes it may mean having a couple of rounds at the pub, but stopping before you pass out on the floor. And on and on.
Again, how are these ideas wrong?