Well, but let's be realistic here - Spidey is a nice guy, sure, but he's also a busy one. At a certain point, he's got to make some sort of a judgement call as to whether or not a budding criminal needs help, or just needs stopping. He's got bad guys to fight, after all - and after all the thousands of malefactors he's stopped during his career, he probably has a pretty good idea which crooks can be reasoned with and which crooks are just crooks.