Teachers provide an essential education to our future generations. It is unfair to allow them the power to simply walk off the job because they feel they're not being paid enough. There are other ways to ensure that they are being treated equitably without sacrificing the benefits to our children. For example, mediation has worked in the past for other professionals such as in the healthcare industry to avoid detrimental effects on society. If we allow teachers the ability to go on strike, they will never be happy with what they have.
Teachers are workers just like everybody else and if you want to change the industry, striking is a pretty good way to do it. In my opinion teachers are treated like second class citizens, they go to school and obtain their bachelor's degree, then have to deal with unappreciative children on a daily basis. Just like anyone else, if they're not being treated fairly they should be able to demand better working conditions and higher pay.
Yes, teachers are workers like everybody else but they work in an industry that simply requires a higher level of responsibility than some others. Striking is an effective method of making change, however not when it is at the expense of an innocent third party - especially one that cannot necessarily understand the reasons for, or the consequences of, the strike.
And I'm sorry, they "then have to deal with unappreciative children on a daily basis"? If that's the case, they shouldn't be a teacher at all - I'm confident the issue has nothing to do with teachers feeling that the children are unappreciative, it is that they feel they are not being treated fairly by the government. They should absolutely be able to demand better working conditions, striking is certainly not the only means of doing this, and is an extreme and inappropriate method to use in this situation - not to mention the message that it sends to children that when you don't get your way, you should just quit.