Two reasons for having a higher bridge. One is that there is less risk for the strings vibrating against the fingerboard. Second would be that you get more downwards pressure on the top from the bridge when it is higher. This creates more power. That being said, you want the strings to be easier to press down and a violin that can produce a large sound with low strings.

I didn't mean that it is necessarily better. All I am saying is that a bridge that is too low cannot be raised where as a bridge that is slightly too high can easily be lowered. Also, some people prefer a slightly higher bridge whereas others want it low for less pressure on the fingers. Just wanted to point out that there are advantages to either. You need to find what works for you. Also, different string types and pressures can compensate for either solution.