Where serious crimes like rape and murder (but not manslaughter) still come with heavy sentences (like 15-25 years) but in a place where you can be rehabilitated so when you get out it doesn't come to a second strike. (Also, the fact that rapists often get sentences under 10 years in this country is pretty ridiculous, and is what allows them to actually get around to committing the crime 3 times. (15 year sentences 3 times starting at age 15 would make you 60. How are people committing 3 rapes in the first place?)
Basically I'm fine with the 3 strike laws as long as we fix the root problems in the first place. (And also fix the definition of felony to not include non-violent, non-serious crimes).