Notpashut, if you are just installing a filter and saying that is enough, you have NOT done your job as a parent. That is like giving your kid the drivers ed book and saying thats enough to drive.
A parent should be involved in what their kids are looking at online. The internet should only be available in a public area of the home and should primarily be used when others are awake and able to see everything that is going on. A parent should also constantly talk to their kids about the dangers of the internet etc.
Granted, kids can get around a filter. But they can also get around the no internet at home. My step-nieces have no problem doing anything they want online and their parents dont allow them to have internet. They went to the library, to friends etc. So banning it won’t work either unless you ban them from being friends with anyone who has internet at home. (They live in an out of town community so it isnt so feasible to say no to all the kids there!)
Education is often a more powerful tool than restriction.