He is the creator of the documentary Article Eighteen, co-founder of the Equality March in Lublin association and the Miłość Nie Wyklucza foundation ('Love Does Not Exclude'), which promotes same-sex marriage in Poland.

Previously the European Court of Human Rights held that bans on pride marches violate the European Convention of Human Rights after mayor Lech Kaczyński tried to ban the Equality Parade in Warsaw on the same grounds.

[16] During trial an expert report revealed that detonating of such homemade explosives in a crowd could have led to fatalities.

[17] Following a plea with the prosecutor, the pair were sentenced to a year in prison - with the charges limited to the illegal manufacture and possession of explosive devices likely to bring danger to the life or health of many people.

Despite it being present at Polish Pride Parades and Marches since 2014,[19] this time, according to conservative and right-wing circles, such a display constituted an insult to the state symbols, and the Minister of Internal Affairs and Administration at the time, Joachim Brudziński accused Staszewski of desecrating the national symbols of Poland.

[20] Brudziński's actions triggered protests of the LGBT community under the slogan Rainbow does not offend (Tęcza nie obraża), the prosecutor's office refused to initiate an investigation due to the lack of signs of a criminal act.

[22] In 2018, Law and Justice councillor Tomasz Pitucha claimed that the Lublin equality march promotes pedophilia.

[23][24] On 24 July 2019, the conservative weekly newspaper Gazeta Polska started to distribute 'LGBT-free zone' stickers.

[25] In response to this action, Staszewski filed a lawsuit for the violation of personal rights against the newspaper together with a motion to withdraw the stickers.