Well I guess the homeless caravaners weren't likely to be wearing their tinted contact lenses on the day they decide to storm the border.They are using a less concentrated form of tear gas, but as ALL tear gas is SAFE, non lethal, with no damage other than discomfort, it is a somewhat erroneous statement.
The reason we were warned not to wear contacts on gas training day was because it would cause the contacts to melt onto your eyeballs. You consider that "safe"?
How about the choking and spitting that you do while on it? If one of those immigrants suffered from asthma, it could be deadly.
You ever been tear gassed? I have, and it's no picnic when you are going through it, and even with cleanup, the effects can be felt for up to an hour. Longer, if you don't have a change of clothes, because you will itch like crazy.
Should have have just farted a smelly one instead? Would that have been less dangerous gas in your view?