Growing up you may have been taught to seize opportunities when they appear, because they won’t last forever. This is true, and it is generally a good idea to never saw no to opportunities as long as there isn’t a huge sacrifice or it isn’t a huge scam like the MLM “business opportunities”.
That is the positive side of seizing opportunities. There are those that take opportunities to commit indecent acts. Take for example rioting. A lot of these rioters do not really care about the issue, and will use it as an excuse to loot or vandalize things. People often do things when given the opportunities, and will use pretenses to justify it.