Finally, everyone can decide for themselves if they want/should buy Soda or not.

I'm not an english grammar teacher but here goes. The sentence could be written "help to trap the killer". In this case the "to" is assumed. In conversation sometimes words are not spoken/written when the meaning is obvious. You would be correct to insert "to" but it would be understood if you did not. Perhaps a grammar teacher will also respond.

Opportunity

Life does not give you many opportunities. Once appeared opportunity you must seize it , no matter how the results and create opportunities for yourself. That's your life , not of orthers.

Opportunity

Life does not give you many opportunities.   When they appear, seize them and create opportunities for yourself.  It is your life and not others.

The Causes and Effects of Child Laborers

The world is becoming better and better, but there are also many problems. Some people are living a hard life. Many children have to be laborers and they do not receive a good education.
There are many causes of child laborers. They must leave home and work to make to make money because their families are very poor or their families ask them to drop out of school. Sometimes children lose warm houses and have do not have enough to eat. No children want to become laborers.
Whatever the cause of child laborers, the effects are the same. They get little care from others, often feel lonely and work in dangerous conditions.  They earn very little money for their efforts.   
The governments are trying to solve their problems. I hope everyone can live a happy life.