The answer is clear and simple - inbound linking cannot hurt your search ranking. How is this known for certain? Well, for one, if inbound were to hurt your rank, your competitors would continually link to your site from link farms. Such a scenario is beyond your control. For this reason, Google cannot penalize your site for any inbound linking.
Are Blogs Good for SEO?
Whether blogs are good for SEO purposes is actually irrelevant. The content is key. Blogs are simply a publishing mechanism. Having said that, the ability to produce high quality content on an ongoing basis can be made much easier by leveraging blog software - especially for the for non-technical user.