Well spammers spent a lot of time researching ways to spam your website. All you have to do is push a button to delete all their spam. As you can see spammers are wasting their time. They are not gaining anything by spamming.
Webmasters and developers are creating apps that allow them to just push one button to delete all spams. This is a nice thing to have isn’t it.
In short, spammers does not gain anything and should be feeling bad of what they are doing. Let me know if this is the way to hand it to the spammers.